isdn_lib.c

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/*
 * Chan_Misdn -- Channel Driver for Asterisk
 *
 * Interface to mISDN
 *
 * Copyright (C) 2004, Christian Richter
 *
 * Christian Richter <crich@beronet.com>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License
 */

/*! \file
 * \brief Interface to mISDN
 * \author Christian Richter <crich@beronet.com>
 */



#include <syslog.h>
#include <sys/time.h>
#include <mISDNuser/isdn_debug.h>

#include "isdn_lib_intern.h"
#include "isdn_lib.h"

enum event_response_e (*cb_event)(enum event_e event, struct misdn_bchannel *bc, void *user_data);

void (*cb_log)(int level, int port, char *tmpl, ...)
   __attribute__ ((format (printf, 3, 4)));

int (*cb_jb_empty)(struct misdn_bchannel *bc, char *buffer, int len);


/*
 * Define ARRAY_LEN() because I cannot
 * #include "asterisk/utils.h"
 */
#define ARRAY_LEN(a) (sizeof(a) / sizeof(a[0]))

#include "asterisk/causes.h"

void misdn_join_conf(struct misdn_bchannel *bc, int conf_id);
void misdn_split_conf(struct misdn_bchannel *bc, int conf_id);

int queue_cleanup_bc(struct misdn_bchannel *bc) ;

int misdn_lib_get_l2_up(struct misdn_stack *stack);

struct misdn_stack *get_misdn_stack(void);

int misdn_lib_port_is_pri(int port)
{
   struct misdn_stack *stack=get_misdn_stack();
   for ( ; stack; stack=stack->next) {
      if (stack->port == port) {
         return stack->pri;
      }
   }

   return -1;
}

int misdn_lib_port_is_nt(int port)
{
   struct misdn_stack *stack=get_misdn_stack();
   for ( ; stack; stack=stack->next) {
      if (stack->port == port) {
         return stack->nt;
      }
   }

   return -1;
}

void misdn_make_dummy(struct misdn_bchannel *dummybc, int port, int l3id, int nt, int channel)
{
   memset (dummybc,0,sizeof(struct misdn_bchannel));
   dummybc->port=port;
   if (l3id==0)
      dummybc->l3_id = MISDN_ID_DUMMY;
   else
      dummybc->l3_id=l3id;

   dummybc->nt=nt;
   dummybc->dummy=1;
   dummybc->channel=channel;
}

int misdn_lib_port_block(int port)
{
   struct misdn_stack *stack=get_misdn_stack();
   for ( ; stack; stack=stack->next) {
      if (stack->port == port) {
         stack->blocked=1;
         return 0;
      }
   }
   return -1;

}

int misdn_lib_port_unblock(int port)
{
   struct misdn_stack *stack=get_misdn_stack();
   for ( ; stack; stack=stack->next) {
      if (stack->port == port) {
         stack->blocked=0;
         return 0;
      }
   }
   return -1;

}

int misdn_lib_is_port_blocked(int port)
{
   struct misdn_stack *stack=get_misdn_stack();
   for ( ; stack; stack=stack->next) {
      if (stack->port == port) {
         return stack->blocked;
      }
   }
   return -1;
}

int misdn_lib_is_ptp(int port)
{
   struct misdn_stack *stack=get_misdn_stack();
   for ( ; stack; stack=stack->next) {
      if (stack->port == port) return stack->ptp;
   }
   return -1;
}

int misdn_lib_get_maxchans(int port)
{
   struct misdn_stack *stack=get_misdn_stack();
   for ( ; stack; stack=stack->next) {
      if (stack->port == port) {
         if (stack->pri)
            return 30;
         else
            return 2;
      }
   }
   return -1;
}


struct misdn_stack *get_stack_by_bc(struct misdn_bchannel *bc)
{
   struct misdn_stack *stack = get_misdn_stack();

   if (!bc)
      return NULL;

   for ( ; stack; stack = stack->next) {
      if (bc->port == stack->port)
         return stack;
   }

   return NULL;
}


void get_show_stack_details(int port, char *buf)
{
   struct misdn_stack *stack = get_misdn_stack();

   for (; stack; stack = stack->next) {
      if (stack->port == port) {
         break;
      }
   }

   if (stack) {
      sprintf(buf, "* Port %2d Type %s Prot. %s L2Link %s L1Link:%s Blocked:%d",
         stack->port,
         stack->nt ? "NT" : "TE",
         stack->ptp ? "PTP" : "PMP",
         stack->l2link ? "UP  " : "DOWN",
         stack->l1link ? "UP  " : "DOWN",
         stack->blocked);
   } else {
      buf[0] = 0;
   }
}


static int nt_err_cnt =0 ;

enum global_states {
   MISDN_INITIALIZING,
   MISDN_INITIALIZED
} ;

static enum global_states  global_state=MISDN_INITIALIZING;


#include <mISDNuser/net_l2.h>
#include <mISDNuser/tone.h>
#include <unistd.h>
#include <semaphore.h>
#include <pthread.h>
#include <signal.h>

#include "isdn_lib.h"


struct misdn_lib {
   /*! \brief mISDN device handle returned by mISDN_open() */
   int midev;
   int midev_nt;  /* Not used */

   pthread_t event_thread;
   pthread_t event_handler_thread;

   void *user_data;

   msg_queue_t upqueue;
   msg_queue_t activatequeue;

   sem_t new_msg;

   struct misdn_stack *stack_list;
} ;

#ifndef ECHOCAN_ON
#define ECHOCAN_ON 123
#define ECHOCAN_OFF 124
#endif

#define MISDN_DEBUG 0

void misdn_tx_jitter(struct misdn_bchannel *bc, int len);

struct misdn_bchannel *find_bc_by_l3id(struct misdn_stack *stack, unsigned long l3id);

int setup_bc(struct misdn_bchannel *bc);

int manager_isdn_handler(iframe_t *frm ,msg_t *msg);

int misdn_lib_port_restart(int port);
int misdn_lib_pid_restart(int pid);

extern struct isdn_msg msgs_g[];

#define ISDN_PID_L3_B_USER 0x430000ff
#define ISDN_PID_L4_B_USER 0x440000ff

/* #define MISDN_IBUF_SIZE 1024 */
#define MISDN_IBUF_SIZE 512

/*  Fine Tuning of Inband  Signalling time */
#define TONE_ALERT_CNT 41 /*  1 Sec  */
#define TONE_ALERT_SILENCE_CNT 200 /*  4 Sec */

#define TONE_BUSY_CNT 20 /*  ? */
#define TONE_BUSY_SILENCE_CNT 48 /*  ? */

static int entity;

static struct misdn_lib *glob_mgr;

static char tone_425_flip[TONE_425_SIZE];
static char tone_silence_flip[TONE_SILENCE_SIZE];

static void misdn_lib_isdn_event_catcher(void *arg);
static int handle_event_nt(void *dat, void *arg);


void stack_holder_add(struct misdn_stack *stack, struct misdn_bchannel *holder);
void stack_holder_remove(struct misdn_stack *stack, struct misdn_bchannel *holder);
struct misdn_bchannel *stack_holder_find(struct misdn_stack *stack, unsigned long l3id);

/* from isdn_lib.h */
   /* user iface */
void te_lib_destroy(int midev) ;
struct misdn_bchannel *manager_find_bc_by_pid(int pid);
void manager_ph_control_block(struct misdn_bchannel *bc, int c1, void *c2, int c2_len);
void manager_clean_bc(struct misdn_bchannel *bc );
void manager_bchannel_setup (struct misdn_bchannel *bc);
void manager_bchannel_cleanup (struct misdn_bchannel *bc);

void ec_chunk( struct misdn_bchannel *bc, unsigned char *rxchunk, unsigned char *txchunk, int chunk_size);
   /* end */
int bchdev_echocancel_activate(struct misdn_bchannel* dev);
void bchdev_echocancel_deactivate(struct misdn_bchannel* dev);
/* end */


static char *bearer2str(int cap) {
   static char *bearers[]={
      "Speech",
      "Audio 3.1k",
      "Unres Digital",
      "Res Digital",
      "Unknown Bearer"
   };

   switch (cap) {
   case INFO_CAPABILITY_SPEECH:
      return bearers[0];
      break;
   case INFO_CAPABILITY_AUDIO_3_1K:
      return bearers[1];
      break;
   case INFO_CAPABILITY_DIGITAL_UNRESTRICTED:
      return bearers[2];
      break;
   case INFO_CAPABILITY_DIGITAL_RESTRICTED:
      return bearers[3];
      break;
   default:
      return bearers[4];
      break;
   }
}


static char flip_table[256];

static void init_flip_bits(void)
{
   int i,k;

   for (i = 0 ; i < 256 ; i++) {
      unsigned char sample = 0 ;
      for (k = 0; k<8; k++) {
         if ( i & 1 << k ) sample |= 0x80 >>  k;
      }
      flip_table[i] = sample;
   }
}

static char * flip_buf_bits ( char * buf , int len)
{
   int i;
   char * start = buf;

   for (i = 0 ; i < len; i++) {
      buf[i] = flip_table[(unsigned char)buf[i]];
   }

   return start;
}




static msg_t *create_l2msg(int prim, int dinfo, int size) /* NT only */
{
   int i = 0;
   msg_t *dmsg;

   while(i < 10)
   {
      dmsg = prep_l3data_msg(prim, dinfo, size, 256, NULL);
      if (dmsg)
         return(dmsg);

      if (!i)
         printf("cannot allocate memory, trying again...\n");
      i++;
      usleep(300000);
   }
   printf("cannot allocate memory, system overloaded.\n");
   exit(-1);
}



msg_t *create_l3msg(int prim, int mt, int dinfo, int size, int ntmode)
{
   int i = 0;
   msg_t *dmsg;
   Q931_info_t *qi;
   iframe_t *frm;

   if (!ntmode)
      size = sizeof(Q931_info_t)+2;

   while(i < 10) {
      if (ntmode) {
         dmsg = prep_l3data_msg(prim, dinfo, size, 256, NULL);
         if (dmsg) {
            return(dmsg);
         }
      } else {
         dmsg = alloc_msg(size+256+mISDN_HEADER_LEN+DEFAULT_HEADROOM);
         if (dmsg)
         {
            memset(msg_put(dmsg,size+mISDN_HEADER_LEN), 0, size+mISDN_HEADER_LEN);
            frm = (iframe_t *)dmsg->data;
            frm->prim = prim;
            frm->dinfo = dinfo;
            qi = (Q931_info_t *)(dmsg->data + mISDN_HEADER_LEN);
            qi->type = mt;
            return(dmsg);
         }
      }

      if (!i) printf("cannot allocate memory, trying again...\n");
      i++;
      usleep(300000);
   }
   printf("cannot allocate memory, system overloaded.\n");
   exit(-1);
}


static int send_msg (int midev, struct misdn_bchannel *bc, msg_t *dmsg)
{
   iframe_t *frm = (iframe_t *)dmsg->data;
   struct misdn_stack *stack=get_stack_by_bc(bc);

   if (!stack) {
      cb_log(0,bc->port,"send_msg: IEK!! no stack\n ");
      return -1;
   }

   frm->addr = (stack->upper_id | FLG_MSG_DOWN);
   frm->dinfo = bc->l3_id;
   frm->len = (dmsg->len) - mISDN_HEADER_LEN;

   cb_log(4,stack->port,"Sending msg, prim:%x addr:%x dinfo:%x\n",frm->prim,frm->addr,frm->dinfo);

   mISDN_write(midev, dmsg->data, dmsg->len, TIMEOUT_1SEC);
   free_msg(dmsg);

   return 0;
}


static int mypid=1;


int misdn_cap_is_speech(int cap)
/** Poor mans version **/
{
   if ( (cap != INFO_CAPABILITY_DIGITAL_UNRESTRICTED) &&
        (cap != INFO_CAPABILITY_DIGITAL_RESTRICTED) ) return 1;
   return 0;
}

int misdn_inband_avail(struct misdn_bchannel *bc)
{

   if (!bc->early_bconnect) {
      /* We have opted to never receive any available inband recorded messages */
      return 0;
   }

   switch (bc->progress_indicator) {
   case INFO_PI_INBAND_AVAILABLE:
   case INFO_PI_CALL_NOT_E2E_ISDN:
   case INFO_PI_CALLED_NOT_ISDN:
      return 1;
   default:
      return 0;
   }
   return 0;
}


static void dump_chan_list(struct misdn_stack *stack)
{
   int i;

   for (i = 0; i <= stack->b_num; ++i) {
      cb_log(6, stack->port, "Idx:%d stack->cchan:%d in_use:%d Chan:%d\n",
         i, stack->channels[i], stack->bc[i].in_use, i + 1);
   }
#if defined(AST_MISDN_ENHANCEMENTS)
   for (i = MAX_BCHANS + 1; i < ARRAY_LEN(stack->bc); ++i) {
      if (stack->bc[i].in_use) {
         cb_log(6, stack->port, "Idx:%d stack->cchan:%d REGISTER Chan:%d in_use\n",
            i, stack->channels[i], i + 1);
      }
   }
#endif   /* defined(AST_MISDN_ENHANCEMENTS) */
}


void misdn_dump_chanlist(void)
{
   struct misdn_stack *stack=get_misdn_stack();
   for ( ; stack; stack=stack->next) {
      dump_chan_list(stack);
   }

}

static int set_chan_in_stack(struct misdn_stack *stack, int channel)
{
   cb_log(4,stack->port,"set_chan_in_stack: %d\n",channel);
   dump_chan_list(stack);
   if (1 <= channel && channel <= ARRAY_LEN(stack->channels)) {
      if (!stack->channels[channel-1])
         stack->channels[channel-1] = 1;
      else {
         cb_log(4,stack->port,"channel already in use:%d\n", channel );
         return -1;
      }
   } else {
      cb_log(0,stack->port,"couldn't set channel %d in\n", channel );
      return -1;
   }

   return 0;
}



static int find_free_chan_in_stack(struct misdn_stack *stack, struct misdn_bchannel *bc, int channel, int dec)
{
   int i;
   int chan = 0;
   int bnums;

   if (bc->channel_found) {
      return 0;
   }

   bc->channel_found = 1;

#if defined(AST_MISDN_ENHANCEMENTS)
   if (bc->is_register_pool) {
      pthread_mutex_lock(&stack->st_lock);
      for (i = MAX_BCHANS + 1; i < ARRAY_LEN(stack->channels); ++i) {
         if (!stack->channels[i]) {
            chan = i + 1;
            cb_log(3, stack->port, " --> found REGISTER chan: %d\n", chan);
            break;
         }
      }
   } else
#endif   /* defined(AST_MISDN_ENHANCEMENTS) */
   {
      cb_log(5, stack->port, "find_free_chan: req_chan:%d\n", channel);

      if (channel < 0 || channel > MAX_BCHANS) {
         cb_log(0, stack->port, " !! out of bound call to find_free_chan_in_stack! (ch:%d)\n", channel);
         return 0;
      }

      --channel;

      pthread_mutex_lock(&stack->st_lock);
      bnums = stack->pri ? stack->b_num : stack->b_num - 1;
      if (dec) {
         for (i = bnums; i >= 0; --i) {
            if (i != 15 && (channel < 0 || i == channel)) { /* skip E1 D channel ;) and work with chan preselection */
               if (!stack->channels[i]) {
                  chan = i + 1;
                  cb_log(3, stack->port, " --> found chan%s: %d\n", channel >= 0 ? " (preselected)" : "", chan);
                  break;
               }
            }
         }
      } else {
         for (i = 0; i <= bnums; ++i) {
            if (i != 15 && (channel < 0 || i == channel)) { /* skip E1 D channel ;) and work with chan preselection */
               if (!stack->channels[i]) {
                  chan = i + 1;
                  cb_log(3, stack->port, " --> found chan%s: %d\n", channel >= 0 ? " (preselected)" : "", chan);
                  break;
               }
            }
         }
      }
   }

   if (!chan) {
      pthread_mutex_unlock(&stack->st_lock);
      cb_log(1, stack->port, " !! NO FREE CHAN IN STACK\n");
      dump_chan_list(stack);
      bc->out_cause = AST_CAUSE_NORMAL_CIRCUIT_CONGESTION;
      return -1;
   }

   if (set_chan_in_stack(stack, chan) < 0) {
      pthread_mutex_unlock(&stack->st_lock);
      cb_log(0, stack->port, "Channel Already in use:%d\n", chan);
      bc->out_cause = AST_CAUSE_REQUESTED_CHAN_UNAVAIL;
      return -1;
   }
   pthread_mutex_unlock(&stack->st_lock);

   bc->channel = chan;
   return 0;
}

/*!
 * \internal
 * \brief Release a B channel to the allocation pool.
 *
 * \param stack Which port stack B channel belongs.
 * \param channel B channel to release. (Range 1-MAX_BCHANS representing B1-Bn)
 *
 * \return Nothing
 *
 * \note
 * Must be called after clean_up_bc() to make sure that the media stream is
 * no longer connected.
 */
static void empty_chan_in_stack(struct misdn_stack *stack, int channel)
{
   if (channel < 1 || ARRAY_LEN(stack->channels) < channel) {
      cb_log(0, stack->port, "empty_chan_in_stack: cannot empty channel %d\n", channel);
      return;
   }

   cb_log(4, stack->port, "empty_chan_in_stack: %d\n", channel);
   stack->channels[channel - 1] = 0;
   dump_chan_list(stack);
}

char *bc_state2str(enum bchannel_state state) {
   int i;

   struct bchan_state_s {
      char *n;
      enum bchannel_state s;
   } states[] = {
      {"BCHAN_CLEANED", BCHAN_CLEANED },
      {"BCHAN_EMPTY", BCHAN_EMPTY},
      {"BCHAN_SETUP", BCHAN_SETUP},
      {"BCHAN_SETUPED", BCHAN_SETUPED},
      {"BCHAN_ACTIVE", BCHAN_ACTIVE},
      {"BCHAN_ACTIVATED", BCHAN_ACTIVATED},
      {"BCHAN_BRIDGE",  BCHAN_BRIDGE},
      {"BCHAN_BRIDGED", BCHAN_BRIDGED},
      {"BCHAN_RELEASE", BCHAN_RELEASE},
      {"BCHAN_RELEASED", BCHAN_RELEASED},
      {"BCHAN_CLEAN", BCHAN_CLEAN},
      {"BCHAN_CLEAN_REQUEST", BCHAN_CLEAN_REQUEST},
      {"BCHAN_ERROR", BCHAN_ERROR}
   };

   for (i=0; i< sizeof(states)/sizeof(struct bchan_state_s); i++)
      if ( states[i].s == state)
         return states[i].n;

   return "UNKNOWN";
}

void bc_state_change(struct misdn_bchannel *bc, enum bchannel_state state)
{
   cb_log(5,bc->port,"BC_STATE_CHANGE: l3id:%x from:%s to:%s\n",
      bc->l3_id,
          bc_state2str(bc->bc_state),
          bc_state2str(state) );

   switch (state) {
      case BCHAN_ACTIVATED:
         if (bc->next_bc_state ==  BCHAN_BRIDGED) {
            misdn_join_conf(bc, bc->conf_id);
            bc->next_bc_state = BCHAN_EMPTY;
            return;
         }
      default:
         bc->bc_state=state;
         break;
   }
}

static void bc_next_state_change(struct misdn_bchannel *bc, enum bchannel_state state)
{
   cb_log(5,bc->port,"BC_NEXT_STATE_CHANGE: from:%s to:%s\n",
          bc_state2str(bc->next_bc_state),
          bc_state2str(state) );

   bc->next_bc_state=state;
}

/*!
 * \internal
 * \brief Empty the B channel record of most call data.
 *
 * \param bc B channel record to empty of most call data.
 *
 * \return Nothing
 *
 * \note
 * Sets the last_used time and must be called before clearing bc->in_use.
 */
static void empty_bc(struct misdn_bchannel *bc)
{
   bc->caller.presentation = 0;  /* allowed */
   bc->caller.number_plan = NUMPLAN_ISDN;
   bc->caller.number_type = NUMTYPE_UNKNOWN;
   bc->caller.name[0] = 0;
   bc->caller.number[0] = 0;
   bc->caller.subaddress[0] = 0;

   bc->connected.presentation = 0;  /* allowed */
   bc->connected.number_plan = NUMPLAN_ISDN;
   bc->connected.number_type = NUMTYPE_UNKNOWN;
   bc->connected.name[0] = 0;
   bc->connected.number[0] = 0;
   bc->connected.subaddress[0] = 0;

   bc->redirecting.from.presentation = 0; /* allowed */
   bc->redirecting.from.number_plan = NUMPLAN_ISDN;
   bc->redirecting.from.number_type = NUMTYPE_UNKNOWN;
   bc->redirecting.from.name[0] = 0;
   bc->redirecting.from.number[0] = 0;
   bc->redirecting.from.subaddress[0] = 0;

   bc->redirecting.to.presentation = 0;   /* allowed */
   bc->redirecting.to.number_plan = NUMPLAN_ISDN;
   bc->redirecting.to.number_type = NUMTYPE_UNKNOWN;
   bc->redirecting.to.name[0] = 0;
   bc->redirecting.to.number[0] = 0;
   bc->redirecting.to.subaddress[0] = 0;

   bc->redirecting.reason = mISDN_REDIRECTING_REASON_UNKNOWN;
   bc->redirecting.count = 0;
   bc->redirecting.to_changed = 0;

   bc->dummy=0;

   bc->bframe_len=0;

   bc->cw= 0;

   bc->dec=0;
   bc->channel = 0;

   bc->sending_complete = 0;

   bc->restart_channel=0;

   bc->conf_id = 0;

   bc->need_more_infos = 0;

   bc->send_dtmf=0;
   bc->nodsp=0;
   bc->nojitter=0;

   bc->time_usec=0;

   bc->rxgain=0;
   bc->txgain=0;

   bc->crypt=0;
   bc->curptx=0; bc->curprx=0;

   bc->crypt_key[0] = 0;

   bc->generate_tone=0;
   bc->tone_cnt=0;

   bc->active = 0;

   bc->early_bconnect = 1;

#ifdef MISDN_1_2
   *bc->pipeline = 0;
#else
   bc->ec_enable = 0;
   bc->ec_deftaps = 128;
#endif

   bc->AOCD_need_export = 0;

   bc->orig=0;

   bc->cause = AST_CAUSE_NORMAL_CLEARING;
   bc->out_cause = AST_CAUSE_NORMAL_CLEARING;

   bc->display_connected = 0; /* none */
   bc->display_setup = 0;  /* none */

   bc->outgoing_colp = 0;/* pass */

   bc->presentation = 0;   /* allowed */
   bc->set_presentation = 0;

   bc->notify_description_code = mISDN_NOTIFY_CODE_INVALID;

   bc->evq=EVENT_NOTHING;

   bc->progress_coding=0;
   bc->progress_location=0;
   bc->progress_indicator=0;

#if defined(AST_MISDN_ENHANCEMENTS)
   bc->div_leg_3_rx_wanted = 0;
   bc->div_leg_3_tx_pending = 0;
#endif   /* defined(AST_MISDN_ENHANCEMENTS) */

/** Set Default Bearer Caps **/
   bc->capability=INFO_CAPABILITY_SPEECH;
   bc->law=INFO_CODEC_ALAW;
   bc->mode=0;
   bc->rate=0x10;
   bc->user1=0;
   bc->urate=0;

   bc->hdlc=0;

   bc->dialed.number_plan = NUMPLAN_ISDN;
   bc->dialed.number_type = NUMTYPE_UNKNOWN;
   bc->dialed.number[0] = 0;
   bc->dialed.subaddress[0] = 0;

   bc->info_dad[0] = 0;
   bc->display[0] = 0;
   bc->infos_pending[0] = 0;
   bc->uu[0]=0;
   bc->uulen=0;

   bc->fac_in.Function = Fac_None;
   bc->fac_out.Function = Fac_None;

   bc->te_choose_channel = 0;
   bc->channel_found= 0;

   gettimeofday(&bc->last_used, NULL);
}


static int clean_up_bc(struct misdn_bchannel *bc)
{
   int ret=0;
   unsigned char buff[32];
   struct misdn_stack * stack;

   cb_log(3, bc?bc->port:0, "$$$ CLEANUP CALLED pid:%d\n", bc?bc->pid:-1);

   if (!bc  ) return -1;
   stack=get_stack_by_bc(bc);

   if (!stack) return -1;

   switch (bc->bc_state ) {
   case BCHAN_CLEANED:
      cb_log(5, stack->port, "$$$ Already cleaned up bc with stid :%x\n", bc->b_stid);
      return -1;

   default:
      break;
   }

   cb_log(2, stack->port, "$$$ Cleaning up bc with stid :%x pid:%d\n", bc->b_stid, bc->pid);

   manager_ec_disable(bc);

   manager_bchannel_deactivate(bc);

   mISDN_write_frame(stack->midev, buff, bc->layer_id|FLG_MSG_TARGET|FLG_MSG_DOWN, MGR_DELLAYER | REQUEST, 0, 0, NULL, TIMEOUT_1SEC);

   bc->b_stid = 0;
   bc_state_change(bc, BCHAN_CLEANED);

   return ret;
}



static void clear_l3(struct misdn_stack *stack)
{
   int i;

   if (global_state == MISDN_INITIALIZED) {
      for (i = 0; i <= stack->b_num; ++i) {
         cb_event(EVENT_CLEANUP, &stack->bc[i], NULL);
         empty_bc(&stack->bc[i]);
         clean_up_bc(&stack->bc[i]);
         empty_chan_in_stack(stack, i + 1);
         stack->bc[i].in_use = 0;
      }
#if defined(AST_MISDN_ENHANCEMENTS)
      for (i = MAX_BCHANS + 1; i < ARRAY_LEN(stack->bc); ++i) {
         empty_bc(&stack->bc[i]);
         empty_chan_in_stack(stack, i + 1);
         stack->bc[i].in_use = 0;
      }
#endif   /* defined(AST_MISDN_ENHANCEMENTS) */
   }
}

static int new_te_id = 0;

static int misdn_lib_get_l1_down(struct misdn_stack *stack)
{
   /* Pull Up L1 */
   iframe_t act;
   act.prim = PH_DEACTIVATE | REQUEST;
   act.addr = stack->lower_id|FLG_MSG_DOWN;
   act.dinfo = 0;
   act.len = 0;

   cb_log(1, stack->port, "SENDING PH_DEACTIVATE | REQ\n");
   return mISDN_write(stack->midev, &act, mISDN_HEADER_LEN+act.len, TIMEOUT_1SEC);
}


static int misdn_lib_get_l2_down(struct misdn_stack *stack)
{

   if (stack->ptp && (stack->nt) ) {
      msg_t *dmsg;
      /* L2 */
      dmsg = create_l2msg(DL_RELEASE| REQUEST, 0, 0);

      pthread_mutex_lock(&stack->nstlock);
      if (stack->nst.manager_l3(&stack->nst, dmsg))
         free_msg(dmsg);
      pthread_mutex_unlock(&stack->nstlock);
   } else {
      iframe_t act;

      act.prim = DL_RELEASE| REQUEST;
      act.addr = (stack->upper_id |FLG_MSG_DOWN)  ;

      act.dinfo = 0;
      act.len = 0;
      return mISDN_write(stack->midev, &act, mISDN_HEADER_LEN+act.len, TIMEOUT_1SEC);
   }

   return 0;
}


static int misdn_lib_get_l1_up(struct misdn_stack *stack)
{
   /* Pull Up L1 */
   iframe_t act;
   act.prim = PH_ACTIVATE | REQUEST;
   act.addr = (stack->upper_id | FLG_MSG_DOWN)  ;


   act.dinfo = 0;
   act.len = 0;

   return mISDN_write(stack->midev, &act, mISDN_HEADER_LEN+act.len, TIMEOUT_1SEC);

}

int misdn_lib_get_l2_up(struct misdn_stack *stack)
{

   if (stack->ptp && (stack->nt) ) {
      msg_t *dmsg;
      /* L2 */
      dmsg = create_l2msg(DL_ESTABLISH | REQUEST, 0, 0);

      pthread_mutex_lock(&stack->nstlock);
      if (stack->nst.manager_l3(&stack->nst, dmsg))
         free_msg(dmsg);
      pthread_mutex_unlock(&stack->nstlock);
   } else {
      iframe_t act;

      act.prim = DL_ESTABLISH | REQUEST;
      act.addr = (stack->upper_id |FLG_MSG_DOWN)  ;

      act.dinfo = 0;
      act.len = 0;
      return mISDN_write(stack->midev, &act, mISDN_HEADER_LEN+act.len, TIMEOUT_1SEC);
   }

   return 0;
}

#if 0
static int misdn_lib_get_l2_te_ptp_up(struct misdn_stack *stack)
{
   iframe_t act;

   act.prim = DL_ESTABLISH | REQUEST;
   act.addr = (stack->upper_id  & ~LAYER_ID_MASK) | 3 | FLG_MSG_DOWN;

   act.dinfo = 0;
   act.len = 0;
   return mISDN_write(stack->midev, &act, mISDN_HEADER_LEN+act.len, TIMEOUT_1SEC);
   return 0;
}
#endif

static int misdn_lib_get_short_status(struct misdn_stack *stack)
{
   iframe_t act;


   act.prim = MGR_SHORTSTATUS | REQUEST;

   act.addr = (stack->upper_id | MSG_BROADCAST)  ;

   act.dinfo = SSTATUS_BROADCAST_BIT | SSTATUS_ALL;

   act.len = 0;
   return mISDN_write(stack->midev, &act, mISDN_HEADER_LEN+act.len, TIMEOUT_1SEC);
}



static int create_process(int midev, struct misdn_bchannel *bc)
{
   iframe_t ncr;
   int l3_id;
   int proc_id;
   struct misdn_stack *stack;

   stack = get_stack_by_bc(bc);
   if (stack->nt) {
      if (find_free_chan_in_stack(stack, bc, bc->channel_preselected ? bc->channel : 0, 0) < 0) {
         return -1;
      }
      cb_log(4, stack->port, " -->  found channel: %d\n", bc->channel);

      for (proc_id = 0; proc_id < MAXPROCS; ++proc_id) {
         if (stack->procids[proc_id] == 0) {
            break;
         }
      }
      if (proc_id == MAXPROCS) {
         cb_log(0, stack->port, "Couldn't Create New ProcId.\n");
         return -1;
      }

      stack->procids[proc_id] = 1;

      l3_id = 0xff00 | proc_id;
      bc->l3_id = l3_id;
      cb_log(3, stack->port, " --> new_l3id %x\n", l3_id);
   } else {
      if ((stack->pri && stack->ptp) || bc->te_choose_channel) {
         /* we know exactly which channels are in use */
         if (find_free_chan_in_stack(stack, bc, bc->channel_preselected ? bc->channel : 0, bc->dec) < 0) {
            return -1;
         }
         cb_log(2, stack->port, " -->  found channel: %d\n", bc->channel);
      } else {
         /* other phones could have made a call also on this port (ptmp) */
         bc->channel = 0xff;
      }

      /* if we are in te-mode, we need to create a process first */
      if (++new_te_id > 0xffff) {
         new_te_id = 0x0001;
      }

      l3_id = (entity << 16) | new_te_id;
      bc->l3_id = l3_id;
      cb_log(3, stack->port, "--> new_l3id %x\n", l3_id);

      /* send message */
      ncr.prim = CC_NEW_CR | REQUEST;
      ncr.addr = (stack->upper_id | FLG_MSG_DOWN);
      ncr.dinfo = l3_id;
      ncr.len = 0;
      mISDN_write(midev, &ncr, mISDN_HEADER_LEN + ncr.len, TIMEOUT_1SEC);
   }

   return l3_id;
}


void misdn_lib_setup_bc(struct misdn_bchannel *bc)
{
   clean_up_bc(bc);
   setup_bc(bc);
}


int setup_bc(struct misdn_bchannel *bc)
{
   unsigned char buff[1025];
   int midev;
   int channel;
   int b_stid;
   int i;
   mISDN_pid_t pid;
   int ret;

   struct misdn_stack *stack=get_stack_by_bc(bc);

   if (!stack) {
      cb_log(0, bc->port, "setup_bc: NO STACK FOUND!!\n");
      return -1;
   }

   midev = stack->midev;
   channel = bc->channel - 1 - (bc->channel > 16);
   b_stid = stack->b_stids[channel >= 0 ? channel : 0];

   switch (bc->bc_state) {
      case BCHAN_CLEANED:
         break;
      default:
         cb_log(4, stack->port, "$$$ bc already setup stid :%x (state:%s)\n", b_stid, bc_state2str(bc->bc_state) );
         return -1;
   }

   cb_log(5, stack->port, "$$$ Setting up bc with stid :%x\n", b_stid);

   /*check if the b_stid is already initialized*/
   for (i=0; i <= stack->b_num; i++) {
      if (stack->bc[i].b_stid == b_stid) {
         cb_log(0, bc->port, "setup_bc: b_stid:%x already in use !!!\n", b_stid);
         return -1;
      }
   }

   if (b_stid <= 0) {
      cb_log(0, stack->port," -- Stid <=0 at the moment in channel:%d\n",channel);

      bc_state_change(bc,BCHAN_ERROR);
      return 1;
   }

   bc->b_stid = b_stid;

   {
      layer_info_t li;
      memset(&li, 0, sizeof(li));

      li.object_id = -1;
      li.extentions = 0;

      li.st = bc->b_stid; /*  given idx */


#define MISDN_DSP
#ifndef MISDN_DSP
      bc->nodsp=1;
#endif
      if ( bc->hdlc || bc->nodsp) {
         cb_log(4, stack->port,"setup_bc: without dsp\n");
         {
            int l = sizeof(li.name);
            strncpy(li.name, "B L3", l);
            li.name[l-1] = 0;
         }
         li.pid.layermask = ISDN_LAYER((3));
         li.pid.protocol[3] = ISDN_PID_L3_B_USER;

         bc->layer=3;
      } else {
         cb_log(4, stack->port,"setup_bc: with dsp\n");
         {
            int l = sizeof(li.name);
            strncpy(li.name, "B L4", l);
            li.name[l-1] = 0;
         }
         li.pid.layermask = ISDN_LAYER((4));
         li.pid.protocol[4] = ISDN_PID_L4_B_USER;

         bc->layer=4;
      }

      ret = mISDN_new_layer(midev, &li);
      if (ret ) {
         cb_log(0, stack->port,"New Layer Err: %d %s\n",ret,strerror(errno));

         bc_state_change(bc,BCHAN_ERROR);
         return(-EINVAL);
      }

      bc->layer_id = li.id;
   }

   memset(&pid, 0, sizeof(pid));



   cb_log(4, stack->port," --> Channel is %d\n", bc->channel);

   if (bc->nodsp && !bc->hdlc) {
      cb_log(2, stack->port," --> TRANSPARENT Mode (no DSP, no HDLC)\n");
      pid.protocol[1] = ISDN_PID_L1_B_64TRANS;
      pid.protocol[2] = ISDN_PID_L2_B_TRANS;
      pid.protocol[3] = ISDN_PID_L3_B_USER;
      pid.layermask = ISDN_LAYER((1)) | ISDN_LAYER((2)) | ISDN_LAYER((3));

   } else if ( bc->hdlc ) {
      cb_log(2, stack->port," --> HDLC Mode\n");
      pid.protocol[1] = ISDN_PID_L1_B_64HDLC ;
      pid.protocol[2] = ISDN_PID_L2_B_TRANS  ;
      pid.protocol[3] = ISDN_PID_L3_B_USER;
      pid.layermask = ISDN_LAYER((1)) | ISDN_LAYER((2)) | ISDN_LAYER((3)) ;
   } else {
      cb_log(2, stack->port," --> TRANSPARENT Mode\n");
      pid.protocol[1] = ISDN_PID_L1_B_64TRANS;
      pid.protocol[2] = ISDN_PID_L2_B_TRANS;
      pid.protocol[3] = ISDN_PID_L3_B_DSP;
      pid.protocol[4] = ISDN_PID_L4_B_USER;
      pid.layermask = ISDN_LAYER((1)) | ISDN_LAYER((2)) | ISDN_LAYER((3)) | ISDN_LAYER((4));

   }

   ret = mISDN_set_stack(midev, bc->b_stid, &pid);

   if (ret){
      cb_log(0, stack->port,"$$$ Set Stack Err: %d %s\n",ret,strerror(errno));

      mISDN_write_frame(midev, buff, bc->layer_id, MGR_DELLAYER | REQUEST, 0, 0, NULL, TIMEOUT_1SEC);

      bc_state_change(bc,BCHAN_ERROR);
      cb_event(EVENT_BCHAN_ERROR, bc, glob_mgr->user_data);
      return(-EINVAL);
   }

   ret = mISDN_get_setstack_ind(midev, bc->layer_id);

   if (ret) {
      cb_log(0, stack->port,"$$$ Set StackIND Err: %d %s\n",ret,strerror(errno));
      mISDN_write_frame(midev, buff, bc->layer_id, MGR_DELLAYER | REQUEST, 0, 0, NULL, TIMEOUT_1SEC);

      bc_state_change(bc,BCHAN_ERROR);
      cb_event(EVENT_BCHAN_ERROR, bc, glob_mgr->user_data);
      return(-EINVAL);
   }

   ret = mISDN_get_layerid(midev, bc->b_stid, bc->layer) ;

   bc->addr = ret>0? ret : 0;

   if (!bc->addr) {
      cb_log(0, stack->port,"$$$ Get Layerid Err: %d %s\n",ret,strerror(errno));
      mISDN_write_frame(midev, buff, bc->layer_id, MGR_DELLAYER | REQUEST, 0, 0, NULL, TIMEOUT_1SEC);

      bc_state_change(bc,BCHAN_ERROR);
      cb_event(EVENT_BCHAN_ERROR, bc, glob_mgr->user_data);
      return (-EINVAL);
   }

   manager_bchannel_activate(bc);

   bc_state_change(bc,BCHAN_ACTIVATED);

   return 0;
}



/** IFACE **/
static int init_bc(struct misdn_stack *stack, struct misdn_bchannel *bc, int midev, int port, int bidx)
{
   if (!bc) {
      return -1;
   }

   cb_log(8, port, "Init.BC %d.\n",bidx);

   bc->send_lock=malloc(sizeof(struct send_lock));
   if (!bc->send_lock) {
      return -1;
   }
   pthread_mutex_init(&bc->send_lock->lock, NULL);

   empty_bc(bc);
   bc_state_change(bc, BCHAN_CLEANED);

   bc->port=stack->port;
   bc->nt=stack->nt?1:0;
   bc->pri=stack->pri;

   {
      ibuffer_t* ibuf= init_ibuffer(MISDN_IBUF_SIZE);

      if (!ibuf) return -1;

      clear_ibuffer( ibuf);

      ibuf->rsem=malloc(sizeof(sem_t));
      if (!ibuf->rsem) {
         return -1;
      }

      bc->astbuf=ibuf;

      if (sem_init(ibuf->rsem,1,0)<0)
         sem_init(ibuf->rsem,0,0);

   }

#if 0 /* This code does not seem to do anything useful */
   if (bidx <= stack->b_num) {
      unsigned char buff[1025];
      iframe_t *frm = (iframe_t *) buff;
      stack_info_t *stinf;
      int ret;

      ret = mISDN_get_stack_info(midev, stack->port, buff, sizeof(buff));
      if (ret < 0) {
         cb_log(0, port, "%s: Cannot get stack info for this port. (ret=%d)\n", __FUNCTION__, ret);
         return -1;
      }

      stinf = (stack_info_t *)&frm->data.p;

      cb_log(8, port, " --> Child %x\n",stinf->child[bidx]);
   }
#endif

   return 0;
}



static struct misdn_stack *stack_init(int midev, int port, int ptp)
{
   int ret;
   unsigned char buff[1025];
   iframe_t *frm = (iframe_t *)buff;
   stack_info_t *stinf;
   struct misdn_stack *stack;
   int i;
   layer_info_t li;

   stack = calloc(1, sizeof(struct misdn_stack));
   if (!stack) {
      return NULL;
   }

   cb_log(8, port, "Init. Stack.\n");

   stack->port=port;
   stack->midev=midev;
   stack->ptp=ptp;

   stack->holding=NULL;
   stack->pri=0;

   msg_queue_init(&stack->downqueue);
   msg_queue_init(&stack->upqueue);

   pthread_mutex_init(&stack->st_lock, NULL);

   /* query port's requirements */
   ret = mISDN_get_stack_info(midev, port, buff, sizeof(buff));
   if (ret < 0) {
      cb_log(0, port, "%s: Cannot get stack info for this port. (ret=%d)\n", __FUNCTION__, ret);
      return(NULL);
   }

   stinf = (stack_info_t *)&frm->data.p;

   stack->d_stid = stinf->id;
   stack->b_num = stinf->childcnt;

   for (i=0; i<=stinf->childcnt; i++)
      stack->b_stids[i] = stinf->child[i];

   switch(stinf->pid.protocol[0] & ~ISDN_PID_FEATURE_MASK) {
   case ISDN_PID_L0_TE_S0:
      stack->nt=0;
      break;
   case ISDN_PID_L0_NT_S0:
      cb_log(8, port, "NT Stack\n");

      stack->nt=1;
      break;
   case ISDN_PID_L0_TE_E1:
      cb_log(8, port, "TE S2M Stack\n");
      stack->nt=0;
      stack->pri=1;
      break;
   case ISDN_PID_L0_NT_E1:
      cb_log(8, port, "TE S2M Stack\n");
      stack->nt=1;
      stack->pri=1;

      break;
   default:
      cb_log(0, port, "this is a unknown port type 0x%08x\n", stinf->pid.protocol[0]);

   }

   if (!stack->nt) {
      if (stinf->pid.protocol[2] & ISDN_PID_L2_DF_PTP ) {
         stack->ptp = 1;
      } else {
         stack->ptp = 0;
      }
   }

   {
      int ret;
      int nt=stack->nt;

      cb_log(8, port, "Init. Stack.\n");

      memset(&li, 0, sizeof(li));
      {
         int l = sizeof(li.name);
         strncpy(li.name,nt?"net l2":"user l4", l);
         li.name[l-1] = 0;
      }
      li.object_id = -1;
      li.extentions = 0;
      li.pid.protocol[nt?2:4] = nt?ISDN_PID_L2_LAPD_NET:ISDN_PID_L4_CAPI20;
      li.pid.layermask = ISDN_LAYER((nt?2:4));
      li.st = stack->d_stid;


      ret = mISDN_new_layer(midev, &li);
      if (ret) {
         cb_log(0, port, "%s: Cannot add layer %d to this port.\n", __FUNCTION__, nt?2:4);
         return(NULL);
      }


      stack->upper_id = li.id;
      ret = mISDN_register_layer(midev, stack->d_stid, stack->upper_id);
      if (ret)
      {
         cb_log(0,port,"Cannot register layer %d of this port.\n", nt?2:4);
         return(NULL);
      }

      stack->lower_id = mISDN_get_layerid(midev, stack->d_stid, nt?1:3);
      if (stack->lower_id < 0) {
         cb_log(0, port, "%s: Cannot get layer(%d) id of this port.\n", __FUNCTION__, nt?1:3);
         return(NULL);
      }

      stack->upper_id = mISDN_get_layerid(midev, stack->d_stid, nt?2:4);
      if (stack->upper_id < 0) {
         cb_log(0, port, "%s: Cannot get layer(%d) id of this port.\n", __FUNCTION__, 2);
         return(NULL);
      }

      cb_log(8, port, "NT Stacks upper_id %x\n",stack->upper_id);


      /* create nst (nt-mode only) */
      if (nt) {

         memset(&stack->nst, 0, sizeof(net_stack_t));
         memset(&stack->mgr, 0, sizeof(manager_t));

         stack->mgr.nst = &stack->nst;
         stack->nst.manager = &stack->mgr;

         stack->nst.l3_manager = handle_event_nt;
         stack->nst.device = midev;
         stack->nst.cardnr = port;
         stack->nst.d_stid = stack->d_stid;

         stack->nst.feature = FEATURE_NET_HOLD;
         if (stack->ptp)
            stack->nst.feature |= FEATURE_NET_PTP;
         if (stack->pri)
            stack->nst.feature |= FEATURE_NET_CRLEN2 | FEATURE_NET_EXTCID;

         stack->nst.l1_id = stack->lower_id;
         stack->nst.l2_id = stack->upper_id;

         msg_queue_init(&stack->nst.down_queue);
         pthread_mutex_init(&stack->nstlock, NULL);

         Isdnl2Init(&stack->nst);
         Isdnl3Init(&stack->nst);

      }

      stack->l1link=0;
      stack->l2link=0;
#if 0
      if (!stack->nt) {
         misdn_lib_get_short_status(stack);
      } else {
         misdn_lib_get_l1_up(stack);
         if (!stack->ptp) misdn_lib_get_l1_up(stack);
         misdn_lib_get_l2_up(stack);
      }
#endif

      misdn_lib_get_short_status(stack);
      misdn_lib_get_l1_up(stack);
      misdn_lib_get_l2_up(stack);

   }

   cb_log(8,0,"stack_init: port:%d lowerId:%x  upperId:%x\n",stack->port,stack->lower_id, stack->upper_id);

   return stack;
}


static void stack_destroy(struct misdn_stack *stack)
{
   char buf[1024];
   if (!stack) return;

   if (stack->nt) {
      pthread_mutex_destroy(&stack->nstlock);
      cleanup_Isdnl2(&stack->nst);
      cleanup_Isdnl3(&stack->nst);
   }

   if (stack->lower_id)
      mISDN_write_frame(stack->midev, buf, stack->lower_id, MGR_DELLAYER | REQUEST, 0, 0, NULL, TIMEOUT_1SEC);

   if (stack->upper_id)
      mISDN_write_frame(stack->midev, buf, stack->upper_id, MGR_DELLAYER | REQUEST, 0, 0, NULL, TIMEOUT_1SEC);

   pthread_mutex_destroy(&stack->st_lock);
}


static struct misdn_stack * find_stack_by_addr(int  addr)
{
   struct misdn_stack *stack;

   for (stack = glob_mgr->stack_list; stack; stack = stack->next) {
      if ((stack->upper_id & STACK_ID_MASK) == (addr & STACK_ID_MASK)) {
         /* Found the stack */
         break;
      }
   }

   return stack;
}


static struct misdn_stack *find_stack_by_port(int port)
{
   struct misdn_stack *stack;

   for (stack = glob_mgr->stack_list; stack; stack = stack->next) {
      if (stack->port == port) {
         /* Found the stack */
         break;
      }
   }

   return stack;
}

static struct misdn_stack *find_stack_by_mgr(manager_t *mgr_nt)
{
   struct misdn_stack *stack;

   for (stack = glob_mgr->stack_list; stack; stack = stack->next) {
      if (&stack->mgr == mgr_nt) {
         /* Found the stack */
         break;
      }
   }

   return stack;
}

static struct misdn_bchannel *find_bc_by_masked_l3id(struct misdn_stack *stack, unsigned long l3id, unsigned long mask)
{
   int i;

   for (i = 0; i <= stack->b_num; ++i) {
      if (stack->bc[i].in_use && (stack->bc[i].l3_id & mask) == (l3id & mask)) {
         return &stack->bc[i];
      }
   }
#if defined(AST_MISDN_ENHANCEMENTS)
   /* Search the B channel records for a REGISTER signaling link. */
   for (i = MAX_BCHANS + 1; i < ARRAY_LEN(stack->bc); ++i) {
      if (stack->bc[i].in_use && (stack->bc[i].l3_id & mask) == (l3id & mask)) {
         return &stack->bc[i];
      }
   }
#endif   /* defined(AST_MISDN_ENHANCEMENTS) */
   return stack_holder_find(stack, l3id);
}


struct misdn_bchannel *find_bc_by_l3id(struct misdn_stack *stack, unsigned long l3id)
{
   int i;

   for (i = 0; i <= stack->b_num; ++i) {
      if (stack->bc[i].in_use && stack->bc[i].l3_id == l3id) {
         return &stack->bc[i];
      }
   }
#if defined(AST_MISDN_ENHANCEMENTS)
   /* Search the B channel records for a REGISTER signaling link. */
   for (i = MAX_BCHANS + 1; i < ARRAY_LEN(stack->bc); ++i) {
      if (stack->bc[i].in_use && stack->bc[i].l3_id == l3id) {
         return &stack->bc[i];
      }
   }
#endif   /* defined(AST_MISDN_ENHANCEMENTS) */
   return stack_holder_find(stack, l3id);
}

static struct misdn_bchannel *find_bc_by_addr(unsigned long addr)
{
   struct misdn_stack *stack;
   int i;

   for (stack = glob_mgr->stack_list; stack; stack = stack->next) {
      for (i = 0; i <= stack->b_num; i++) {
         if (stack->bc[i].in_use
            && ((stack->bc[i].addr & STACK_ID_MASK) == (addr & STACK_ID_MASK)
               || stack->bc[i].layer_id == addr)) {
            return &stack->bc[i];
         }
      }
   }

   return NULL;
}

static struct misdn_bchannel *find_bc_by_confid(unsigned long confid)
{
   struct misdn_stack *stack;
   int i;

   for (stack = glob_mgr->stack_list; stack; stack = stack->next) {
      for (i = 0; i <= stack->b_num; i++) {
         if (stack->bc[i].in_use && stack->bc[i].conf_id == confid) {
            return &stack->bc[i];
         }
      }
   }
   return NULL;
}


static struct misdn_bchannel *find_bc_by_channel(int port, int channel)
{
   struct misdn_stack *stack = find_stack_by_port(port);
   int i;

   if (!stack) {
      return NULL;
   }

   for (i = 0; i <= stack->b_num; i++) {
      if (stack->bc[i].in_use && stack->bc[i].channel == channel) {
         return &stack->bc[i];
      }
   }

   return NULL;
}





static int handle_event ( struct misdn_bchannel *bc, enum event_e event, iframe_t *frm)
{
   struct misdn_stack *stack=get_stack_by_bc(bc);

   if (!stack->nt) {

      switch (event) {

      case EVENT_CONNECT_ACKNOWLEDGE:
         setup_bc(bc);

         if ( *bc->crypt_key ) {
            cb_log(4, stack->port,
               "ENABLING BLOWFISH channel:%d caller%d:\"%s\" <%s> dialed%d:%s\n",
               bc->channel,
               bc->caller.number_type,
               bc->caller.name,
               bc->caller.number,
               bc->dialed.number_type,
               bc->dialed.number);
            manager_ph_control_block(bc,  BF_ENABLE_KEY, bc->crypt_key, strlen(bc->crypt_key) );
         }

         if (misdn_cap_is_speech(bc->capability)) {
            if (  !bc->nodsp) manager_ph_control(bc,  DTMF_TONE_START, 0);
            manager_ec_enable(bc);

            if ( bc->txgain != 0 ) {
               cb_log(4, stack->port, "--> Changing txgain to %d\n", bc->txgain);
               manager_ph_control(bc, VOL_CHANGE_TX, bc->txgain);
            }
            if ( bc->rxgain != 0 ) {
               cb_log(4, stack->port, "--> Changing rxgain to %d\n", bc->rxgain);
               manager_ph_control(bc, VOL_CHANGE_RX, bc->rxgain);
            }
         }

         break;
      case EVENT_CONNECT:

         if ( *bc->crypt_key ) {
            cb_log(4, stack->port,
               "ENABLING BLOWFISH channel:%d caller%d:\"%s\" <%s> dialed%d:%s\n",
               bc->channel,
               bc->caller.number_type,
               bc->caller.name,
               bc->caller.number,
               bc->dialed.number_type,
               bc->dialed.number);
            manager_ph_control_block(bc,  BF_ENABLE_KEY, bc->crypt_key, strlen(bc->crypt_key) );
         }
      case EVENT_ALERTING:
      case EVENT_PROGRESS:
      case EVENT_PROCEEDING:
      case EVENT_SETUP_ACKNOWLEDGE:
      case EVENT_SETUP:
      {
         if (bc->channel == 0xff || bc->channel<=0)
            bc->channel=0;

         if (find_free_chan_in_stack(stack, bc, bc->channel, 0)<0){
            if (!stack->pri && !stack->ptp)  {
               bc->cw=1;
               break;
            }

            if (!bc->channel) {
               cb_log(0, stack->port, "Any Channel Requested, but we have no more!!\n");
            } else {
               cb_log(0, stack->port,
                  "Requested Channel Already in Use releasing this call with cause %d!!!!\n",
                  bc->out_cause);
            }

            /* when the channel is already in use, we can't
             * simply clear it, we need to make sure that
             * it will still be marked as in_use in the
             * available channels list.*/
            bc->channel=0;

            misdn_lib_send_event(bc,EVENT_RELEASE_COMPLETE);
            return -1;
         }

         setup_bc(bc);
         break;
      }

      case EVENT_RELEASE_COMPLETE:
      case EVENT_RELEASE:
         break;
      default:
         break;
      }
   } else {    /** NT MODE **/

   }
   return 0;
}

static int handle_cr ( struct misdn_stack *stack, iframe_t *frm)
{
   struct misdn_bchannel dummybc;
   struct misdn_bchannel *bc;
   int channel;

   if (!stack) return -1;

   switch (frm->prim) {
   case CC_NEW_CR|INDICATION:
      cb_log(7, stack->port, " --> lib: NEW_CR Ind with l3id:%x on this port.\n",frm->dinfo);

      bc = misdn_lib_get_free_bc(stack->port, 0, 1, 0);
      if (!bc) {
         cb_log(0, stack->port, " --> !! lib: No free channel!\n");
         return -1;
      }

      cb_log(7, stack->port, " --> new_process: New L3Id: %x\n",frm->dinfo);
      bc->l3_id=frm->dinfo;
      return 1;
   case CC_NEW_CR|CONFIRM:
      return 1;
   case CC_NEW_CR|REQUEST:
      return 1;
   case CC_RELEASE_CR|REQUEST:
      return 1;
   case CC_RELEASE_CR|CONFIRM:
      break;
   case CC_RELEASE_CR|INDICATION:
      cb_log(4, stack->port, " --> lib: RELEASE_CR Ind with l3id:%x\n", frm->dinfo);
      bc = find_bc_by_l3id(stack, frm->dinfo);
      if (!bc) {
         cb_log(4, stack->port, " --> Didn't find BC so temporarily creating dummy BC (l3id:%x) on this port.\n", frm->dinfo);
         misdn_make_dummy(&dummybc, stack->port, frm->dinfo, stack->nt, 0);
         bc = &dummybc;
      }

      channel = bc->channel;
      cb_log(4, stack->port, " --> lib: CLEANING UP l3id: %x\n", frm->dinfo);

      /* bc->pid = 0; */
      bc->need_disconnect = 0;
      bc->need_release = 0;
      bc->need_release_complete = 0;

      cb_event(EVENT_CLEANUP, bc, glob_mgr->user_data);

      empty_bc(bc);
      clean_up_bc(bc);

      if (channel > 0)
         empty_chan_in_stack(stack, channel);
      bc->in_use = 0;

      dump_chan_list(stack);

      if (bc->stack_holder) {
         cb_log(4, stack->port, "REMOVING Holder\n");
         stack_holder_remove(stack, bc);
         free(bc);
      }

      return 1;
   default:
      break;
   }

   return 0;
}


/* Empties bc if it's reserved (no SETUP out yet) */
void misdn_lib_release(struct misdn_bchannel *bc)
{
   int channel;
   struct misdn_stack *stack=get_stack_by_bc(bc);

   if (!stack) {
      cb_log(1,0,"misdn_release: No Stack found\n");
      return;
   }

   channel = bc->channel;
   empty_bc(bc);
   clean_up_bc(bc);
   if (channel > 0) {
      empty_chan_in_stack(stack, channel);
   }
   bc->in_use=0;
}




int misdn_lib_get_port_up (int port)
{ /* Pull Up L1 */
   struct misdn_stack *stack;

   for (stack=glob_mgr->stack_list;
        stack;
        stack=stack->next) {

      if (stack->port == port) {

         if (!stack->l1link)
            misdn_lib_get_l1_up(stack);
         if (!stack->l2link)
            misdn_lib_get_l2_up(stack);

         return 0;
      }
   }
   return 0;
}


int misdn_lib_get_port_down (int port)
{ /* Pull Down L1 */
   struct misdn_stack *stack;
   for (stack=glob_mgr->stack_list;
        stack;
        stack=stack->next) {
      if (stack->port == port) {
            if (stack->l2link)
               misdn_lib_get_l2_down(stack);
            misdn_lib_get_l1_down(stack);
         return 0;
      }
   }
   return 0;
}

int misdn_lib_port_up(int port, int check)
{
   struct misdn_stack *stack;


   for (stack=glob_mgr->stack_list;
        stack;
        stack=stack->next) {

      if (stack->port == port) {

         if (stack->blocked) {
            cb_log(0,port, "Port Blocked:%d L2:%d L1:%d\n", stack->blocked, stack->l2link, stack->l1link);
            return -1;
         }

         if (stack->ptp ) {

            if (stack->l1link && stack->l2link) {
               return 1;
            } else {
               cb_log(1,port, "Port Down L2:%d L1:%d\n",
                  stack->l2link, stack->l1link);
               return 0;
            }
         } else {
            if ( !check || stack->l1link )
               return 1;
            else {
               cb_log(1,port, "Port down PMP\n");
               return 0;
            }
         }
      }
   }

   return -1;
}


static int release_cr(struct misdn_stack *stack, mISDNuser_head_t *hh)
{
   struct misdn_bchannel *bc=find_bc_by_l3id(stack, hh->dinfo);
   struct misdn_bchannel dummybc;
   iframe_t frm; /* fake te frm to remove callref from global callreflist */

   frm.dinfo = hh->dinfo;
   frm.addr=stack->upper_id | FLG_MSG_DOWN;
   frm.prim = CC_RELEASE_CR|INDICATION;
   cb_log(4, stack->port, " --> CC_RELEASE_CR: Faking Release_cr for %x l3id:%x\n",frm.addr, frm.dinfo);

   /** removing procid **/
   if (!bc) {
      cb_log(4, stack->port, " --> Didn't find BC so temporarily creating dummy BC (l3id:%x) on this port.\n", hh->dinfo);
      misdn_make_dummy(&dummybc, stack->port, hh->dinfo, stack->nt, 0);
      bc=&dummybc;
   }

   if ((bc->l3_id & 0xff00) == 0xff00) {
      cb_log(4, stack->port, " --> Removing Process Id:%x on this port.\n", bc->l3_id & 0xff);
      stack->procids[bc->l3_id & 0xff] = 0;
   }

   if (handle_cr(stack, &frm)<0) {
   }

   return 0 ;
}

static int handle_event_nt(void *dat, void *arg)
{
   struct misdn_bchannel dummybc;
   struct misdn_bchannel *bc;
   manager_t *mgr = (manager_t *)dat;
   msg_t *msg = (msg_t *)arg;
   msg_t *dmsg;
   mISDNuser_head_t *hh;
   struct misdn_stack *stack;
   enum event_e event;
   int reject=0;
   int l3id;
   int channel;
   int tmpcause;

   if (!msg || !mgr)
      return(-EINVAL);

   stack = find_stack_by_mgr(mgr);
   hh=(mISDNuser_head_t*)msg->data;

   /*
    * When we are called from the mISDNuser lib, the nstlock is held and it
    * must be held when we return.  We unlock here because the lib may be
    * entered again recursively.
    */
   pthread_mutex_unlock(&stack->nstlock);

   cb_log(5, stack->port, " --> lib: prim %x dinfo %x\n",hh->prim, hh->dinfo);
   switch(hh->prim) {
   case CC_RETRIEVE|INDICATION:
   {
      struct misdn_bchannel *hold_bc;
      iframe_t frm; /* fake te frm to add callref to global callreflist */

      frm.dinfo = hh->dinfo;
      frm.addr=stack->upper_id | FLG_MSG_DOWN;
      frm.prim = CC_NEW_CR|INDICATION;
      if (handle_cr( stack, &frm)< 0) {
         goto ERR_NO_CHANNEL;
      }

      bc = find_bc_by_l3id(stack, hh->dinfo);
      hold_bc = stack_holder_find(stack, bc->l3_id);
      cb_log(4, stack->port, "bc_l3id:%x holded_bc_l3id:%x\n",bc->l3_id, hold_bc->l3_id);

      if (hold_bc) {
         cb_log(4, stack->port, "REMOVING Holder\n");

         /* swap the backup to our new channel back */
         stack_holder_remove(stack, hold_bc);
         memcpy(bc, hold_bc, sizeof(*bc));
         free(hold_bc);

         bc->holded=0;
         bc->b_stid=0;
      }
      break;
   }

   case CC_SETUP | CONFIRM:
      l3id = *((int *) (msg->data + mISDNUSER_HEAD_SIZE));

      cb_log(4, stack->port, " --> lib: Event_ind:SETUP CONFIRM [NT] : new L3ID is %x\n", l3id);

      bc = find_bc_by_l3id(stack, hh->dinfo);
      if (bc) {
         cb_log (2, bc->port, "I IND :CC_SETUP|CONFIRM: old l3id:%x new l3id:%x\n", bc->l3_id, l3id);
         bc->l3_id = l3id;
         cb_event(EVENT_NEW_L3ID, bc, glob_mgr->user_data);
      } else {
         cb_log(4, stack->port, "Bc Not found (after SETUP CONFIRM)\n");
      }
      free_msg(msg);
      pthread_mutex_lock(&stack->nstlock);
      return 0;

   case CC_SETUP | INDICATION:
      bc = misdn_lib_get_free_bc(stack->port, 0, 1, 0);
      if (!bc) {
         goto ERR_NO_CHANNEL;
      }

      cb_log(4, stack->port, " --> new_process: New L3Id: %x\n",hh->dinfo);
      bc->l3_id=hh->dinfo;
      break;

#if defined(AST_MISDN_ENHANCEMENTS)
   case CC_REGISTER | CONFIRM:
      l3id = *((int *) (msg->data + mISDNUSER_HEAD_SIZE));

      cb_log(4, stack->port, " --> lib: Event_ind:REGISTER CONFIRM [NT] : new L3ID is %x\n", l3id);

      bc = find_bc_by_l3id(stack, hh->dinfo);
      if (bc) {
         cb_log (2, bc->port, "I IND :CC_REGISTER|CONFIRM: old l3id:%x new l3id:%x\n", bc->l3_id, l3id);
         bc->l3_id = l3id;
      } else {
         cb_log(4, stack->port, "Bc Not found (after REGISTER CONFIRM)\n");
      }
      free_msg(msg);
      pthread_mutex_lock(&stack->nstlock);
      return 0;
#endif   /* defined(AST_MISDN_ENHANCEMENTS) */

#if defined(AST_MISDN_ENHANCEMENTS)
   case CC_REGISTER | INDICATION:
      bc = misdn_lib_get_register_bc(stack->port);
      if (!bc) {
         goto ERR_NO_CHANNEL;
      }

      cb_log(4, stack->port, " --> new_process: New L3Id: %x\n",hh->dinfo);
      bc->l3_id=hh->dinfo;
      break;
#endif   /* defined(AST_MISDN_ENHANCEMENTS) */

   case CC_CONNECT_ACKNOWLEDGE|INDICATION:
      break;

   case CC_ALERTING|INDICATION:
   case CC_PROCEEDING|INDICATION:
   case CC_SETUP_ACKNOWLEDGE|INDICATION:
   case CC_CONNECT|INDICATION:
      break;
   case CC_DISCONNECT|INDICATION:
      bc = find_bc_by_l3id(stack, hh->dinfo);
      if (!bc) {
         bc=find_bc_by_masked_l3id(stack, hh->dinfo, 0xffff0000);
         if (bc) {
            int myprocid=bc->l3_id&0x0000ffff;

            hh->dinfo=(hh->dinfo&0xffff0000)|myprocid;
            cb_log(3,stack->port,"Reject dinfo: %x cause:%d\n",hh->dinfo,bc->cause);
            reject=1;
         }
      }
      break;

   case CC_FACILITY|INDICATION:
      bc = find_bc_by_l3id(stack, hh->dinfo);
      if (!bc) {
         bc=find_bc_by_masked_l3id(stack, hh->dinfo, 0xffff0000);
         if (bc) {
            int myprocid=bc->l3_id&0x0000ffff;

            hh->dinfo=(hh->dinfo&0xffff0000)|myprocid;
            cb_log(4,bc->port,"Repaired reject Bug, new dinfo: %x\n",hh->dinfo);
         }
      }
      break;

   case CC_RELEASE_COMPLETE|INDICATION:
      break;

   case CC_SUSPEND|INDICATION:
      cb_log(4, stack->port, " --> Got Suspend, sending Reject for now\n");
      dmsg = create_l3msg(CC_SUSPEND_REJECT | REQUEST,MT_SUSPEND_REJECT, hh->dinfo,sizeof(RELEASE_COMPLETE_t), 1);
      pthread_mutex_lock(&stack->nstlock);
      stack->nst.manager_l3(&stack->nst, dmsg);
      free_msg(msg);
      return 0;

   case CC_RESUME|INDICATION:
      break;

   case CC_RELEASE|CONFIRM:
      bc = find_bc_by_l3id(stack, hh->dinfo);
      if (bc) {
         cb_log(1, stack->port, "CC_RELEASE|CONFIRM (l3id:%x), sending RELEASE_COMPLETE\n", hh->dinfo);
         misdn_lib_send_event(bc, EVENT_RELEASE_COMPLETE);
      }
      break;

   case CC_RELEASE|INDICATION:
      break;

   case CC_RELEASE_CR|INDICATION:
      release_cr(stack, hh);
      free_msg(msg);
      pthread_mutex_lock(&stack->nstlock);
      return 0;

   case CC_NEW_CR|INDICATION:
      /*  Got New CR for bchan, for now I handle this one in */
      /*  connect_ack, Need to be changed */
      l3id = *((int *) (msg->data + mISDNUSER_HEAD_SIZE));

      bc = find_bc_by_l3id(stack, hh->dinfo);
      if (!bc) {
         cb_log(0, stack->port, " --> In NEW_CR: didn't found bc ??\n");
         pthread_mutex_lock(&stack->nstlock);
         return -1;
      }
      if (((l3id&0xff00)!=0xff00) && ((bc->l3_id&0xff00)==0xff00)) {
         cb_log(4, stack->port, " --> Removing Process Id:%x on this port.\n", 0xff&bc->l3_id);
         stack->procids[bc->l3_id&0xff] = 0 ;
      }
      cb_log(4, stack->port, "lib: Event_ind:CC_NEW_CR : very new L3ID  is %x\n",l3id );

      bc->l3_id =l3id;
      if (!bc->is_register_pool) {
         cb_event(EVENT_NEW_L3ID, bc, glob_mgr->user_data);
      }

      free_msg(msg);
      pthread_mutex_lock(&stack->nstlock);
      return 0;

   case DL_ESTABLISH | INDICATION:
   case DL_ESTABLISH | CONFIRM:
      cb_log(3, stack->port, "%% GOT L2 Activate Info.\n");

      if (stack->ptp && stack->l2link) {
         cb_log(0, stack->port, "%% GOT L2 Activate Info. but we're activated already.. this l2 is faulty, blocking port\n");
         cb_event(EVENT_PORT_ALARM, &stack->bc[0], glob_mgr->user_data);
      }

      if (stack->ptp && !stack->restart_sent) {
         /* make sure we restart the interface of the
          * other side */
         stack->restart_sent=1;
         misdn_lib_send_restart(stack->port, -1);

      }

      /* when we get the L2 UP, the L1 is UP definitely too*/
      stack->l2link = 1;
      stack->l2upcnt=0;

      free_msg(msg);
      pthread_mutex_lock(&stack->nstlock);
      return 0;

   case DL_RELEASE | INDICATION:
   case DL_RELEASE | CONFIRM:
      if (stack->ptp) {
         cb_log(3 , stack->port, "%% GOT L2 DeActivate Info.\n");

         if (stack->l2upcnt>3) {
            cb_log(0 , stack->port, "!!! Could not Get the L2 up after 3 Attempts!!!\n");
         } else {
#if 0
            if (stack->nt)
               misdn_lib_reinit_nt_stack(stack->port);
#endif
            if (stack->l1link) {
               misdn_lib_get_l2_up(stack);
               stack->l2upcnt++;
            }
         }

      } else
         cb_log(3, stack->port, "%% GOT L2 DeActivate Info.\n");

      stack->l2link = 0;
      free_msg(msg);
      pthread_mutex_lock(&stack->nstlock);
      return 0;

   default:
      break;
   }

   /*  Parse Events and fire_up to App. */
   event = isdn_msg_get_event(msgs_g, msg, 1);

   bc = find_bc_by_l3id(stack, hh->dinfo);
   if (!bc) {
      cb_log(4, stack->port, " --> Didn't find BC so temporarily creating dummy BC (l3id:%x).\n", hh->dinfo);
      misdn_make_dummy(&dummybc, stack->port,  hh->dinfo, stack->nt, 0);
      bc = &dummybc;
   }

   isdn_msg_parse_event(msgs_g, msg, bc, 1);

   switch (event) {
   case EVENT_SETUP:
      if (bc->channel <= 0 || bc->channel == 0xff) {
         bc->channel = 0;
      }

      if (find_free_chan_in_stack(stack, bc, bc->channel, 0) < 0) {
         goto ERR_NO_CHANNEL;
      }
      break;
   case EVENT_RELEASE:
   case EVENT_RELEASE_COMPLETE:
      channel = bc->channel;
      tmpcause = bc->cause;

      empty_bc(bc);
      bc->cause = tmpcause;
      clean_up_bc(bc);

      if (channel > 0)
         empty_chan_in_stack(stack, channel);
      bc->in_use = 0;
      break;
   default:
      break;
   }

   if(!isdn_get_info(msgs_g, event, 1)) {
      cb_log(4, stack->port, "Unknown Event Ind: prim %x dinfo %x\n", hh->prim, hh->dinfo);
   } else {
      if (reject) {
         switch(bc->cause) {
         case AST_CAUSE_USER_BUSY:
            cb_log(1, stack->port, "Siemens Busy reject..\n");
            break;
         default:
            break;
         }
      }
      cb_event(event, bc, glob_mgr->user_data);
   }

   free_msg(msg);
   pthread_mutex_lock(&stack->nstlock);
   return 0;

ERR_NO_CHANNEL:
   cb_log(4, stack->port, "Patch from MEIDANIS:Sending RELEASE_COMPLETE %x (No free Chan for you..)\n", hh->dinfo);
   dmsg = create_l3msg(CC_RELEASE_COMPLETE | REQUEST, MT_RELEASE_COMPLETE, hh->dinfo, sizeof(RELEASE_COMPLETE_t), 1);
   pthread_mutex_lock(&stack->nstlock);
   stack->nst.manager_l3(&stack->nst, dmsg);
   free_msg(msg);
   return 0;
}


static int handle_timers(msg_t* msg)
{
   iframe_t *frm= (iframe_t*)msg->data;
   struct misdn_stack *stack;

   /* Timer Stuff */
   switch (frm->prim) {
   case MGR_INITTIMER | CONFIRM:
   case MGR_ADDTIMER | CONFIRM:
   case MGR_DELTIMER | CONFIRM:
   case MGR_REMOVETIMER | CONFIRM:
      free_msg(msg);
      return(1);
   }



   if (frm->prim==(MGR_TIMER | INDICATION) ) {
      for (stack = glob_mgr->stack_list;
           stack;
           stack = stack->next) {
         itimer_t *it;

         if (!stack->nt) continue;

         it = stack->nst.tlist;
         /* find timer */
         for(it=stack->nst.tlist;
             it;
             it=it->next) {
            if (it->id == (int)frm->addr)
               break;
         }
         if (it) {
            mISDN_write_frame(stack->midev, msg->data, frm->addr,
                    MGR_TIMER | RESPONSE, 0, 0, NULL, TIMEOUT_1SEC);
            test_and_clear_bit(FLG_TIMER_RUNING, (long unsigned int *)&it->Flags);
            pthread_mutex_lock(&stack->nstlock);
            it->function(it->data);
            pthread_mutex_unlock(&stack->nstlock);
            free_msg(msg);
            return 1;
         }
      }

      cb_log(0, 0, "Timer Msg without Timer ??\n");
      free_msg(msg);
      return 1;
   }

   return 0;
}



void misdn_lib_tone_generator_start(struct misdn_bchannel *bc)
{
   bc->generate_tone=1;
}

void misdn_lib_tone_generator_stop(struct misdn_bchannel *bc)
{
   bc->generate_tone=0;
}


static int do_tone(struct misdn_bchannel *bc, int len)
{
   bc->tone_cnt=len;

   if (bc->generate_tone) {
      cb_event(EVENT_TONE_GENERATE, bc, glob_mgr->user_data);

      if ( !bc->nojitter ) {
         misdn_tx_jitter(bc,len);
      }

      return 1;
   }

   return 0;
}


#ifdef MISDN_SAVE_DATA
static void misdn_save_data(int id, char *p1, int l1, char *p2, int l2)
{
   char n1[32],n2[32];
   FILE *rx, *tx;

   sprintf(n1,"/tmp/misdn-rx-%d.raw",id);
   sprintf(n2,"/tmp/misdn-tx-%d.raw",id);

   rx = fopen(n1,"a+");
   tx = fopen(n2,"a+");

   if (!rx || !tx) {
      cb_log(0,0,"Couldn't open files: %s\n",strerror(errno));
      if (rx)
         fclose(rx);
      if (tx)
         fclose(tx);
      return ;
   }

   fwrite(p1,1,l1,rx);
   fwrite(p2,1,l2,tx);

   fclose(rx);
   fclose(tx);

}
#endif

void misdn_tx_jitter(struct misdn_bchannel *bc, int len)
{
   char buf[4096 + mISDN_HEADER_LEN];
   char *data=&buf[mISDN_HEADER_LEN];
   iframe_t *txfrm= (iframe_t*)buf;
   int jlen, r;

   jlen=cb_jb_empty(bc,data,len);

   if (jlen) {
#ifdef MISDN_SAVE_DATA
      misdn_save_data((bc->port*100+bc->channel), data, jlen, bc->bframe, bc->bframe_len);
#endif
      flip_buf_bits( data, jlen);

      if (jlen < len) {
         cb_log(1, bc->port, "Jitterbuffer Underrun. Got %d of expected %d\n", jlen, len);
      }

      txfrm->prim = DL_DATA|REQUEST;

      txfrm->dinfo = 0;

      txfrm->addr = bc->addr|FLG_MSG_DOWN; /*  | IF_DOWN; */

      txfrm->len =jlen;
      cb_log(9, bc->port, "Transmitting %d samples 2 misdn\n", txfrm->len);

      r=mISDN_write( glob_mgr->midev, buf, txfrm->len + mISDN_HEADER_LEN, 8000 );
   } else {
#define MISDN_GEN_SILENCE
#ifdef MISDN_GEN_SILENCE
      int cnt=len/TONE_SILENCE_SIZE;
      int rest=len%TONE_SILENCE_SIZE;
      int i;

      for (i=0; i<cnt; i++) {
         memcpy(data, tone_silence_flip, TONE_SILENCE_SIZE );
         data +=TONE_SILENCE_SIZE;
      }

      if (rest) {
         memcpy(data, tone_silence_flip, rest);
      }

      txfrm->prim = DL_DATA|REQUEST;

      txfrm->dinfo = 0;

      txfrm->addr = bc->addr|FLG_MSG_DOWN; /*  | IF_DOWN; */

      txfrm->len =len;
      cb_log(5, bc->port, "Transmitting %d samples of silence to misdn\n", len);

      r=mISDN_write( glob_mgr->midev, buf, txfrm->len + mISDN_HEADER_LEN, 8000 );
#else
      r = 0;
#endif
   }

   if (r < 0) {
      cb_log(1, bc->port, "Error in mISDN_write (%s)\n", strerror(errno));
   }
}

static int handle_bchan(msg_t *msg)
{
   iframe_t *frm= (iframe_t*)msg->data;
   struct misdn_bchannel *bc=find_bc_by_addr(frm->addr);
   struct misdn_stack *stack;

   if (!bc) {
      cb_log(1,0,"handle_bchan: BC not found for prim:%x with addr:%x dinfo:%x\n", frm->prim, frm->addr, frm->dinfo);
      return 0 ;
   }

   stack = get_stack_by_bc(bc);

   if (!stack) {
      cb_log(0, bc->port,"handle_bchan: STACK not found for prim:%x with addr:%x dinfo:%x\n", frm->prim, frm->addr, frm->dinfo);
      return 0;
   }

   switch (frm->prim) {

   case MGR_SETSTACK| CONFIRM:
      cb_log(3, stack->port, "BCHAN: MGR_SETSTACK|CONFIRM pid:%d\n",bc->pid);
      break;

   case MGR_SETSTACK| INDICATION:
      cb_log(3, stack->port, "BCHAN: MGR_SETSTACK|IND pid:%d\n",bc->pid);
   break;
#if 0
   AGAIN:
      bc->addr = mISDN_get_layerid(stack->midev, bc->b_stid, bc->layer);
      if (!bc->addr) {

         if (errno == EAGAIN) {
            usleep(1000);
            goto AGAIN;
         }

         cb_log(0,stack->port,"$$$ Get Layer (%d) Id Error: %s\n",bc->layer,strerror(errno));

         /* we kill the channel later, when we received some
            data. */
         bc->addr= frm->addr;
      } else if ( bc->addr < 0) {
         cb_log(0, stack->port,"$$$ bc->addr <0 Error:%s\n",strerror(errno));
         bc->addr=0;
      }

      cb_log(4, stack->port," --> Got Adr %x\n", bc->addr);

      free_msg(msg);


      switch(bc->bc_state) {
      case BCHAN_SETUP:
         bc_state_change(bc,BCHAN_SETUPED);
      break;

      case BCHAN_CLEAN_REQUEST:
      default:
         cb_log(0, stack->port," --> STATE WASN'T SETUP (but %s) in SETSTACK|IND pid:%d\n",bc_state2str(bc->bc_state), bc->pid);
         clean_up_bc(bc);
      }
      return 1;
#endif

   case MGR_DELLAYER| INDICATION:
      cb_log(3, stack->port, "BCHAN: MGR_DELLAYER|IND pid:%d\n",bc->pid);
      break;

   case MGR_DELLAYER| CONFIRM:
      cb_log(3, stack->port, "BCHAN: MGR_DELLAYER|CNF pid:%d\n",bc->pid);

      bc->pid=0;
      bc->addr=0;

      free_msg(msg);
      return 1;

   case PH_ACTIVATE | INDICATION:
   case DL_ESTABLISH | INDICATION:
      cb_log(3, stack->port, "BCHAN: ACT Ind pid:%d\n", bc->pid);

      free_msg(msg);
      return 1;

   case PH_ACTIVATE | CONFIRM:
   case DL_ESTABLISH | CONFIRM:

      cb_log(3, stack->port, "BCHAN: bchan ACT Confirm pid:%d\n",bc->pid);
      free_msg(msg);

      return 1;

   case DL_ESTABLISH | REQUEST:
      {
         char buf[128];
         mISDN_write_frame(stack->midev, buf, bc->addr | FLG_MSG_TARGET | FLG_MSG_DOWN,  DL_ESTABLISH | CONFIRM, 0,0, NULL, TIMEOUT_1SEC);
      }
      free_msg(msg);
      return 1;

   case DL_RELEASE|REQUEST:
      {
         char buf[128];
         mISDN_write_frame(stack->midev, buf, bc->addr | FLG_MSG_TARGET | FLG_MSG_DOWN,  DL_RELEASE| CONFIRM, 0,0, NULL, TIMEOUT_1SEC);
      }
      free_msg(msg);
      return 1;

   case PH_DEACTIVATE | INDICATION:
   case DL_RELEASE | INDICATION:
      cb_log (3, stack->port, "BCHAN: DeACT Ind pid:%d\n",bc->pid);

      free_msg(msg);
      return 1;

   case PH_DEACTIVATE | CONFIRM:
   case DL_RELEASE | CONFIRM:
      cb_log(3, stack->port, "BCHAN: DeACT Conf pid:%d\n",bc->pid);

      free_msg(msg);
      return 1;

   case PH_CONTROL|INDICATION:
   {
      unsigned int *cont = (unsigned int *) &frm->data.p;

      cb_log(4, stack->port,
         "PH_CONTROL: channel:%d caller%d:\"%s\" <%s> dialed%d:%s \n",
         bc->channel,
         bc->caller.number_type,
         bc->caller.name,
         bc->caller.number,
         bc->dialed.number_type,
         bc->dialed.number);

      if ((*cont & ~DTMF_TONE_MASK) == DTMF_TONE_VAL) {
         int dtmf = *cont & DTMF_TONE_MASK;
         cb_log(4, stack->port, " --> DTMF TONE: %c\n",dtmf);
         bc->dtmf=dtmf;
         cb_event(EVENT_DTMF_TONE, bc, glob_mgr->user_data);

         free_msg(msg);
         return 1;
      }
      if (*cont == BF_REJECT) {
         cb_log(4, stack->port, " --> BF REJECT\n");
         free_msg(msg);
         return 1;
      }
      if (*cont == BF_ACCEPT) {
         cb_log(4, stack->port, " --> BF ACCEPT\n");
         free_msg(msg);
         return 1;
      }
   }
   break;

   case PH_DATA|REQUEST:
   case DL_DATA|REQUEST:
      cb_log(0, stack->port, "DL_DATA REQUEST \n");
      do_tone(bc, 64);

      free_msg(msg);
      return 1;


   case PH_DATA|INDICATION:
   case DL_DATA|INDICATION:
   {
      bc->bframe = (void*)&frm->data.i;
      bc->bframe_len = frm->len;

      /** Anyway flip the bufbits **/
      if ( misdn_cap_is_speech(bc->capability) )
         flip_buf_bits(bc->bframe, bc->bframe_len);


      if (!bc->bframe_len) {
         cb_log(2, stack->port, "DL_DATA INDICATION bc->addr:%x frm->addr:%x\n", bc->addr, frm->addr);
         free_msg(msg);
         return 1;
      }

      if ( (bc->addr&STACK_ID_MASK) != (frm->addr&STACK_ID_MASK) ) {
         cb_log(2, stack->port, "DL_DATA INDICATION bc->addr:%x frm->addr:%x\n", bc->addr, frm->addr);
         free_msg(msg);
         return 1;
      }

#if MISDN_DEBUG
      cb_log(0, stack->port, "DL_DATA INDICATION Len %d\n", frm->len);

#endif

      if ( (bc->bc_state == BCHAN_ACTIVATED) && frm->len > 0) {
         int t;

#ifdef MISDN_B_DEBUG
         cb_log(0,bc->port,"do_tone START\n");
#endif
         t=do_tone(bc,frm->len);

#ifdef MISDN_B_DEBUG
         cb_log(0,bc->port,"do_tone STOP (%d)\n",t);
#endif
         if (  !t ) {
            int i;

            if ( misdn_cap_is_speech(bc->capability)) {
               if ( !bc->nojitter ) {
#ifdef MISDN_B_DEBUG
                  cb_log(0,bc->port,"tx_jitter START\n");
#endif
                  misdn_tx_jitter(bc,frm->len);
#ifdef MISDN_B_DEBUG
                  cb_log(0,bc->port,"tx_jitter STOP\n");
#endif
               }
            }

#ifdef MISDN_B_DEBUG
            cb_log(0,bc->port,"EVENT_B_DATA START\n");
#endif

            i = cb_event(EVENT_BCHAN_DATA, bc, glob_mgr->user_data);
#ifdef MISDN_B_DEBUG
            cb_log(0,bc->port,"EVENT_B_DATA STOP\n");
#endif

            if (i<0) {
               cb_log(10,stack->port,"cb_event returned <0\n");
               /*clean_up_bc(bc);*/
            }
         }
      }
      free_msg(msg);
      return 1;
   }


   case PH_CONTROL | CONFIRM:
      cb_log(4, stack->port, "PH_CONTROL|CNF bc->addr:%x\n", frm->addr);
      free_msg(msg);
      return 1;

   case PH_DATA | CONFIRM:
   case DL_DATA|CONFIRM:
#if MISDN_DEBUG

      cb_log(0, stack->port, "Data confirmed\n");

#endif
      free_msg(msg);
      return 1;
   case DL_DATA|RESPONSE:
#if MISDN_DEBUG
      cb_log(0, stack->port, "Data response\n");

#endif
      break;
   }

   return 0;
}



static int handle_frm_nt(msg_t *msg)
{
   iframe_t *frm= (iframe_t*)msg->data;
   struct misdn_stack *stack;
   int err=0;

   stack=find_stack_by_addr( frm->addr );



   if (!stack || !stack->nt) {
      return 0;
   }


   pthread_mutex_lock(&stack->nstlock);
   if ((err=stack->nst.l1_l2(&stack->nst,msg))) {
      pthread_mutex_unlock(&stack->nstlock);
      if (nt_err_cnt > 0 ) {
         if (nt_err_cnt < 100) {
            nt_err_cnt++;
            cb_log(0, stack->port, "NT Stack sends us error: %d \n", err);
         } else if (nt_err_cnt < 105){
            cb_log(0, stack->port, "NT Stack sends us error: %d over 100 times, so I'll stop this message\n", err);
            nt_err_cnt = - 1;
         }
      }
      free_msg(msg);
      return 1;
   }
   pthread_mutex_unlock(&stack->nstlock);
   return 1;
}


static int handle_frm(msg_t *msg)
{
   struct misdn_bchannel dummybc;
   struct misdn_bchannel *bc;
   iframe_t *frm;
   struct misdn_stack *stack;
   enum event_e event;
   enum event_response_e response;
   int ret;
   int channel;
   int tmpcause;
   int tmp_out_cause;

   frm = (iframe_t*) msg->data;
   stack = find_stack_by_addr(frm->addr);
   if (!stack || stack->nt) {
      return 0;
   }

   cb_log(4, stack ? stack->port : 0, "handle_frm: frm->addr:%x frm->prim:%x\n", frm->addr, frm->prim);

   ret = handle_cr(stack, frm);
   if (ret < 0) {
      cb_log(3, stack ? stack->port : 0, "handle_frm: handle_cr <0 prim:%x addr:%x\n", frm->prim, frm->addr);
   }
   if (ret) {
      free_msg(msg);
      return 1;
   }

   bc = find_bc_by_l3id(stack, frm->dinfo);
   if (!bc) {
      misdn_make_dummy(&dummybc, stack->port, 0, stack->nt, 0);
      switch (frm->prim) {
      case CC_RESTART | CONFIRM:
         dummybc.l3_id = MISDN_ID_GLOBAL;
         bc = &dummybc;
         break;
      case CC_SETUP | INDICATION:
         dummybc.l3_id = frm->dinfo;
         bc = &dummybc;

         misdn_lib_send_event(bc, EVENT_RELEASE_COMPLETE);

         free_msg(msg);
         return 1;
      default:
         if (frm->prim == (CC_FACILITY | INDICATION)) {
            cb_log(5, stack->port, " --> Using Dummy BC for FACILITY\n");
         } else {
            cb_log(0, stack->port, " --> Didn't find BC so temporarily creating dummy BC (l3id:%x) on this port.\n", frm->dinfo);
            dummybc.l3_id = frm->dinfo;
         }
         bc = &dummybc;
         break;
      }
   }

   event = isdn_msg_get_event(msgs_g, msg, 0);
   isdn_msg_parse_event(msgs_g, msg, bc, 0);

   /* Preprocess some Events */
   ret = handle_event(bc, event, frm);
   if (ret < 0) {
      cb_log(0, stack->port, "couldn't handle event\n");
      free_msg(msg);
      return 1;
   }

   /* shoot up event to App: */
   cb_log(5, stack->port, "lib Got Prim: Addr %x prim %x dinfo %x\n", frm->addr, frm->prim, frm->dinfo);

   if (!isdn_get_info(msgs_g, event, 0)) {
      cb_log(0, stack->port, "Unknown Event Ind: Addr:%x prim %x dinfo %x\n", frm->addr, frm->prim, frm->dinfo);
      response = RESPONSE_OK;
   } else {
      response = cb_event(event, bc, glob_mgr->user_data);
   }

   switch (event) {
   case EVENT_SETUP:
      switch (response) {
      case RESPONSE_IGNORE_SETUP_WITHOUT_CLOSE:
         cb_log(0, stack->port, "TOTALLY IGNORING SETUP\n");
         break;
      case RESPONSE_IGNORE_SETUP:
         /* I think we should send CC_RELEASE_CR, but am not sure*/
         bc->out_cause = AST_CAUSE_NORMAL_CLEARING;
         /* fall through */
      case RESPONSE_RELEASE_SETUP:
         misdn_lib_send_event(bc, EVENT_RELEASE_COMPLETE);
         if (bc->channel > 0) {
            empty_chan_in_stack(stack, bc->channel);
         }
         empty_bc(bc);
         bc_state_change(bc, BCHAN_CLEANED);
         bc->in_use = 0;

         cb_log(0, stack->port, "GOT IGNORE SETUP\n");
         break;
      case RESPONSE_OK:
         cb_log(4, stack->port, "GOT SETUP OK\n");
         break;
      default:
         break;
      }
      break;
   case EVENT_RELEASE_COMPLETE:
      /* release bchannel only after we've announced the RELEASE_COMPLETE */
      channel = bc->channel;
      tmpcause = bc->cause;
      tmp_out_cause = bc->out_cause;

      empty_bc(bc);
      bc->cause = tmpcause;
      bc->out_cause = tmp_out_cause;
      clean_up_bc(bc);
      bc->in_use = 0;

      if (tmpcause == AST_CAUSE_REQUESTED_CHAN_UNAVAIL) {
         cb_log(0, stack->port, "**** Received CAUSE:%d, restarting channel %d\n", AST_CAUSE_REQUESTED_CHAN_UNAVAIL, channel);
         misdn_lib_send_restart(stack->port, channel);
      }
      if (channel > 0) {
         empty_chan_in_stack(stack, channel);
      }
      break;
   case EVENT_RESTART:
      cb_log(0, stack->port, "**** Received RESTART channel:%d\n", bc->restart_channel);
      empty_chan_in_stack(stack, bc->restart_channel);
      break;
   default:
      break;
   }

   cb_log(5, stack->port, "Freeing Msg on prim:%x \n", frm->prim);
   free_msg(msg);
   return 1;
}


static int handle_l1(msg_t *msg)
{
   iframe_t *frm = (iframe_t*) msg->data;
   struct misdn_stack *stack = find_stack_by_addr(frm->addr);
   int i ;

   if (!stack) return 0 ;

   switch (frm->prim) {
   case PH_ACTIVATE | CONFIRM:
   case PH_ACTIVATE | INDICATION:
      cb_log (3, stack->port, "L1: PH L1Link Up!\n");
      stack->l1link=1;

      if (stack->nt) {

         pthread_mutex_lock(&stack->nstlock);
         if (stack->nst.l1_l2(&stack->nst, msg))
            free_msg(msg);
         pthread_mutex_unlock(&stack->nstlock);

         if (stack->ptp)
            misdn_lib_get_l2_up(stack);
      } else {
         free_msg(msg);
      }

      for (i=0;i<=stack->b_num; i++) {
         if (stack->bc[i].evq != EVENT_NOTHING) {
            cb_log(4, stack->port, "Firing Queued Event %s because L1 got up\n", isdn_get_info(msgs_g, stack->bc[i].evq, 0));
            misdn_lib_send_event(&stack->bc[i],stack->bc[i].evq);
            stack->bc[i].evq=EVENT_NOTHING;
         }

      }
      return 1;

   case PH_ACTIVATE | REQUEST:
      free_msg(msg);
      cb_log(3,stack->port,"L1: PH_ACTIVATE|REQUEST \n");
      return 1;

   case PH_DEACTIVATE | REQUEST:
      free_msg(msg);
      cb_log(3,stack->port,"L1: PH_DEACTIVATE|REQUEST \n");
      return 1;

   case PH_DEACTIVATE | CONFIRM:
   case PH_DEACTIVATE | INDICATION:
      cb_log (3, stack->port, "L1: PH L1Link Down! \n");

#if 0
      for (i=0; i<=stack->b_num; i++) {
         if (global_state == MISDN_INITIALIZED)  {
            cb_event(EVENT_CLEANUP, &stack->bc[i], glob_mgr->user_data);
         }
      }
#endif

      if (stack->nt) {
         pthread_mutex_lock(&stack->nstlock);
         if (stack->nst.l1_l2(&stack->nst, msg))
            free_msg(msg);
         pthread_mutex_unlock(&stack->nstlock);
      } else {
         free_msg(msg);
      }

      stack->l1link=0;
      stack->l2link=0;
      return 1;
   }

   return 0;
}

static int handle_l2(msg_t *msg)
{
   iframe_t *frm = (iframe_t*) msg->data;

   struct misdn_stack *stack = find_stack_by_addr(frm->addr);

   if (!stack) {
      return 0 ;
   }

   switch(frm->prim) {

   case DL_ESTABLISH | REQUEST:
      cb_log(1,stack->port,"DL_ESTABLISH|REQUEST \n");
      free_msg(msg);
      return 1;
   case DL_RELEASE | REQUEST:
      cb_log(1,stack->port,"DL_RELEASE|REQUEST \n");
      free_msg(msg);
      return 1;

   case DL_ESTABLISH | INDICATION:
   case DL_ESTABLISH | CONFIRM:
   {
      cb_log (3, stack->port, "L2: L2Link Up! \n");
      if (stack->ptp && stack->l2link) {
         cb_log (-1, stack->port, "L2: L2Link Up! but it's already UP.. must be faulty, blocking port\n");
         cb_event(EVENT_PORT_ALARM, &stack->bc[0], glob_mgr->user_data);
      }
      stack->l2link=1;
      free_msg(msg);
      return 1;
   }
   break;

   case DL_RELEASE | INDICATION:
   case DL_RELEASE | CONFIRM:
   {
      cb_log (3, stack->port, "L2: L2Link Down! \n");
      stack->l2link=0;

      free_msg(msg);
      return 1;
   }
   break;
   }
   return 0;
}

static int handle_mgmt(msg_t *msg)
{
   iframe_t *frm = (iframe_t*) msg->data;
   struct misdn_stack *stack;

   if ( (frm->addr == 0) && (frm->prim == (MGR_DELLAYER|CONFIRM)) ) {
      cb_log(2, 0, "MGMT: DELLAYER|CONFIRM Addr: 0 !\n") ;
      free_msg(msg);
      return 1;
   }

   stack = find_stack_by_addr(frm->addr);

   if (!stack) {
      if (frm->prim == (MGR_DELLAYER|CONFIRM)) {
         cb_log(2, 0, "MGMT: DELLAYER|CONFIRM Addr: %x !\n",
               frm->addr) ;
         free_msg(msg);
         return 1;
      }

      return 0;
   }

   switch(frm->prim) {
   case MGR_SHORTSTATUS | INDICATION:
   case MGR_SHORTSTATUS | CONFIRM:
      cb_log(5, stack->port, "MGMT: Short status dinfo %x\n",frm->dinfo);

      switch (frm->dinfo) {
      case SSTATUS_L1_ACTIVATED:
         cb_log(3, stack->port, "MGMT: SSTATUS: L1_ACTIVATED \n");
         stack->l1link=1;

         break;
      case SSTATUS_L1_DEACTIVATED:
         cb_log(3, stack->port, "MGMT: SSTATUS: L1_DEACTIVATED \n");
         stack->l1link=0;
#if 0
         clear_l3(stack);
#endif
         break;

      case SSTATUS_L2_ESTABLISHED:
         cb_log(3, stack->port, "MGMT: SSTATUS: L2_ESTABLISH \n");
         stack->l2link=1;
         break;

      case SSTATUS_L2_RELEASED:
         cb_log(3, stack->port, "MGMT: SSTATUS: L2_RELEASED \n");
         stack->l2link=0;
         break;
      }

      free_msg(msg);
      return 1;

   case MGR_SETSTACK | INDICATION:
      cb_log(4, stack->port, "MGMT: SETSTACK|IND dinfo %x\n",frm->dinfo);
      free_msg(msg);
      return 1;
   case MGR_DELLAYER | CONFIRM:
      cb_log(4, stack->port, "MGMT: DELLAYER|CNF dinfo %x\n",frm->dinfo) ;
      free_msg(msg);
      return 1;

   }

   /*
   if ( (frm->prim & 0x0f0000) ==  0x0f0000) {
   cb_log(5, 0, "$$$ MGMT FRAME: prim %x addr %x dinfo %x\n",frm->prim, frm->addr, frm->dinfo) ;
   free_msg(msg);
   return 1;
   } */

   return 0;
}


static msg_t *fetch_msg(int midev)
{
   msg_t *msg=alloc_msg(MAX_MSG_SIZE);
   int r;

   if (!msg) {
      cb_log(0, 0, "fetch_msg: alloc msg failed !!");
      return NULL;
   }

   AGAIN:
      r=mISDN_read(midev,msg->data,MAX_MSG_SIZE, TIMEOUT_10SEC);
      msg->len=r;

      if (r==0) {
         free_msg(msg); /* danger, cause usually freeing in main_loop */
         cb_log(6,0,"Got empty Msg..\n");
         return NULL;
      }

      if (r<0) {
         if (errno == EAGAIN) {
            /*we wait for mISDN here*/
            cb_log(4,0,"mISDN_read wants us to wait\n");
            usleep(5000);
            goto AGAIN;
         }

         cb_log(0,0,"mISDN_read returned :%d error:%s (%d)\n",r,strerror(errno),errno);
      }

#if 0
               if  (!(frm->prim == (DL_DATA|INDICATION) )|| (frm->prim == (PH_DATA|INDICATION)))
                       cb_log(0,0,"prim: %x dinfo:%x addr:%x msglen:%d frm->len:%d\n",frm->prim, frm->dinfo, frm->addr, msg->len,frm->len );
#endif
      return msg;
}

void misdn_lib_isdn_l1watcher(int port)
{
   struct misdn_stack *stack;

   for (stack = glob_mgr->stack_list; stack && (stack->port != port); stack = stack->next)
      ;

   if (stack) {
      cb_log(4, port, "Checking L1 State\n");
      if (!stack->l1link) {
         cb_log(4, port, "L1 State Down, trying to get it up again\n");
         misdn_lib_get_short_status(stack);
         misdn_lib_get_l1_up(stack);
         misdn_lib_get_l2_up(stack);
      }
   }
}

/* This is a thread */
static void misdn_lib_isdn_event_catcher(void *arg)
{
   struct misdn_lib *mgr = arg;
   int zero_frm=0 , fff_frm=0 ;
   int midev= mgr->midev;
   int port=0;

   while (1) {
      msg_t *msg = fetch_msg(midev);
      iframe_t *frm;


      if (!msg) continue;

      frm = (iframe_t*) msg->data;

      /** When we make a call from NT2Ast we get these frames **/
      if (frm->len == 0 && frm->addr == 0 && frm->dinfo == 0 && frm->prim == 0 ) {
         zero_frm++;
         free_msg(msg);
         continue;
      } else {
         if (zero_frm) {
            cb_log(0, port, "*** Alert: %d zero_frms caught\n", zero_frm);
            zero_frm = 0 ;
         }
      }

      /** I get this sometimes after setup_bc **/
      if (frm->len == 0 &&  frm->dinfo == 0 && frm->prim == 0xffffffff ) {
         fff_frm++;
         free_msg(msg);
         continue;
      } else {
         if (fff_frm) {
            cb_log(0, port, "*** Alert: %d fff_frms caught\n", fff_frm);
            fff_frm = 0 ;
         }
      }

      manager_isdn_handler(frm, msg);
   }

}


/** App Interface **/

static int te_lib_init(void)
{
   char buff[1025] = "";
   iframe_t *frm = (iframe_t *) buff;
   int midev;
   int ret;

   midev = mISDN_open();
   if (midev <= 0) {
      return midev;
   }

   /* create entity for layer 3 TE-mode */
   mISDN_write_frame(midev, buff, 0, MGR_NEWENTITY | REQUEST, 0, 0, NULL, TIMEOUT_1SEC);

   ret = mISDN_read_frame(midev, frm, sizeof(iframe_t), 0, MGR_NEWENTITY | CONFIRM, TIMEOUT_1SEC);
   entity = frm->dinfo & 0xffff;
   if (ret < mISDN_HEADER_LEN || !entity) {
      fprintf(stderr, "cannot request MGR_NEWENTITY from mISDN: %s\n", strerror(errno));
      exit(-1);
   }

   return midev;
}

void te_lib_destroy(int midev)
{
   char buf[1024];
   mISDN_write_frame(midev, buf, 0, MGR_DELENTITY | REQUEST, entity, 0, NULL, TIMEOUT_1SEC);

   cb_log(4, 0, "Entity deleted\n");
   mISDN_close(midev);
   cb_log(4, 0, "midev closed\n");
}

struct misdn_bchannel *manager_find_bc_by_pid(int pid)
{
   struct misdn_stack *stack;
   int i;

   for (stack = glob_mgr->stack_list; stack; stack = stack->next) {
      for (i = 0; i <= stack->b_num; i++) {
         if (stack->bc[i].in_use && stack->bc[i].pid == pid) {
            return &stack->bc[i];
         }
      }
   }

   return NULL;
}

static int test_inuse(struct misdn_bchannel *bc)
{
   struct timeval now;

   if (!bc->in_use) {
      gettimeofday(&now, NULL);
      if (bc->last_used.tv_sec == now.tv_sec
         && misdn_lib_port_is_pri(bc->port)) {
         cb_log(2, bc->port, "channel with stid:%x for one second still in use! (n:%d lu:%d)\n",
            bc->b_stid, (int) now.tv_sec, (int) bc->last_used.tv_sec);
         return 1;
      }

      cb_log(3,bc->port, "channel with stid:%x not in use!\n", bc->b_stid);
      return 0;
   }

   cb_log(2,bc->port, "channel with stid:%x in use!\n", bc->b_stid);
   return 1;
}


static void prepare_bc(struct misdn_bchannel*bc, int channel)
{
   bc->channel = channel;
   bc->channel_preselected = channel?1:0;
   bc->need_disconnect=1;
   bc->need_release=1;
   bc->need_release_complete=1;
   bc->cause = AST_CAUSE_NORMAL_CLEARING;

   if (++mypid>5000) mypid=1;
   bc->pid=mypid;

#if 0
   bc->addr=0;
   bc->b_stid=0;
   bc->layer_id=0;
#endif

   bc->in_use = 1;
}

struct misdn_bchannel *misdn_lib_get_free_bc(int port, int channel, int inout, int dec)
{
   struct misdn_stack *stack;
   int i;
   int maxnum;

   if (channel < 0 || channel > MAX_BCHANS) {
      cb_log(0, port, "Requested channel out of bounds (%d)\n", channel);
      return NULL;
   }

   /* Find the port stack structure */
   stack = find_stack_by_port(port);
   if (!stack) {
      cb_log(0, port, "Port is not configured (%d)\n", port);
      return NULL;
   }

   if (stack->blocked) {
      cb_log(0, port, "Port is blocked\n");
      return NULL;
   }

   pthread_mutex_lock(&stack->st_lock);
   if (channel > 0) {
      if (channel <= stack->b_num) {
         for (i = 0; i < stack->b_num; i++) {
            if (stack->bc[i].channel == channel) {
               if (test_inuse(&stack->bc[i])) {
                  pthread_mutex_unlock(&stack->st_lock);
                  cb_log(0, port, "Requested channel:%d on port:%d is already in use\n", channel, port);
                  return NULL;
               } else {
                  prepare_bc(&stack->bc[i], channel);
                  pthread_mutex_unlock(&stack->st_lock);
                  return &stack->bc[i];
               }
            }
         }
      } else {
         pthread_mutex_unlock(&stack->st_lock);
         cb_log(0, port, "Requested channel:%d is out of bounds on port:%d\n", channel, port);
         return NULL;
      }
   }

   /* Note: channel == 0 here */
   maxnum = (inout && !stack->pri && !stack->ptp) ? stack->b_num + 1 : stack->b_num;
   if (dec) {
      for (i = maxnum - 1; i >= 0; --i) {
         if (!test_inuse(&stack->bc[i])) {
            /* 3. channel on bri means CW*/
            if (!stack->pri && i == stack->b_num) {
               stack->bc[i].cw = 1;
            }

            prepare_bc(&stack->bc[i], channel);
            stack->bc[i].dec = 1;
            pthread_mutex_unlock(&stack->st_lock);
            return &stack->bc[i];
         }
      }
   } else {
      for (i = 0; i < maxnum; ++i) {
         if (!test_inuse(&stack->bc[i])) {
            /* 3. channel on bri means CW */
            if (!stack->pri && i == stack->b_num) {
               stack->bc[i].cw = 1;
            }

            prepare_bc(&stack->bc[i], channel);
            pthread_mutex_unlock(&stack->st_lock);
            return &stack->bc[i];
         }
      }
   }
   pthread_mutex_unlock(&stack->st_lock);

   cb_log(1, port, "There is no free channel on port (%d)\n", port);
   return NULL;
}

#if defined(AST_MISDN_ENHANCEMENTS)
/*!
 * \brief Allocate a B channel struct from the REGISTER pool
 *
 * \param port Logical port number
 *
 * \retval B channel struct on success.
 * \retval NULL on error.
 */
struct misdn_bchannel *misdn_lib_get_register_bc(int port)
{
   struct misdn_stack *stack;
   struct misdn_bchannel *bc;
   unsigned index;

   /* Find the port stack structure */
   stack = find_stack_by_port(port);
   if (!stack) {
      cb_log(0, port, "Port is not configured (%d)\n", port);
      return NULL;
   }

   if (stack->blocked) {
      cb_log(0, port, "Port is blocked\n");
      return NULL;
   }

   pthread_mutex_lock(&stack->st_lock);
   for (index = MAX_BCHANS + 1; index < ARRAY_LEN(stack->bc); ++index) {
      bc = &stack->bc[index];
      if (!test_inuse(bc)) {
         prepare_bc(bc, 0);
         bc->need_disconnect = 0;
         bc->need_release = 0;
         pthread_mutex_unlock(&stack->st_lock);
         return bc;
      }
   }
   pthread_mutex_unlock(&stack->st_lock);

   cb_log(1, port, "There is no free REGISTER link on port (%d)\n", port);
   return NULL;
}
#endif   /* defined(AST_MISDN_ENHANCEMENTS) */

/*!
 * \internal
 * \brief Convert the facility function enum value into a string.
 *
 * \return String version of the enum value
 */
static const char *fac2str(enum FacFunction facility)
{
   static const struct {
      enum FacFunction facility;
      char *name;
   } arr[] = {
/* *INDENT-OFF* */
      { Fac_None, "Fac_None" },
#if defined(AST_MISDN_ENHANCEMENTS)
      { Fac_ERROR, "Fac_ERROR" },
      { Fac_RESULT, "Fac_RESULT" },
      { Fac_REJECT, "Fac_REJECT" },

      { Fac_ActivationDiversion, "Fac_ActivationDiversion" },
      { Fac_DeactivationDiversion, "Fac_DeactivationDiversion" },
      { Fac_ActivationStatusNotificationDiv, "Fac_ActivationStatusNotificationDiv" },
      { Fac_DeactivationStatusNotificationDiv, "Fac_DeactivationStatusNotificationDiv" },
      { Fac_InterrogationDiversion, "Fac_InterrogationDiversion" },
      { Fac_DiversionInformation, "Fac_DiversionInformation" },
      { Fac_CallDeflection, "Fac_CallDeflection" },
      { Fac_CallRerouteing, "Fac_CallRerouteing" },
      { Fac_DivertingLegInformation2, "Fac_DivertingLegInformation2" },
      { Fac_InterrogateServedUserNumbers, "Fac_InterrogateServedUserNumbers" },
      { Fac_DivertingLegInformation1, "Fac_DivertingLegInformation1" },
      { Fac_DivertingLegInformation3, "Fac_DivertingLegInformation3" },

      { Fac_EctExecute, "Fac_EctExecute" },
      { Fac_ExplicitEctExecute, "Fac_ExplicitEctExecute" },
      { Fac_RequestSubaddress, "Fac_RequestSubaddress" },
      { Fac_SubaddressTransfer, "Fac_SubaddressTransfer" },
      { Fac_EctLinkIdRequest, "Fac_EctLinkIdRequest" },
      { Fac_EctInform, "Fac_EctInform" },
      { Fac_EctLoopTest, "Fac_EctLoopTest" },

      { Fac_ChargingRequest, "Fac_ChargingRequest" },
      { Fac_AOCSCurrency, "Fac_AOCSCurrency" },
      { Fac_AOCSSpecialArr, "Fac_AOCSSpecialArr" },
      { Fac_AOCDCurrency, "Fac_AOCDCurrency" },
      { Fac_AOCDChargingUnit, "Fac_AOCDChargingUnit" },
      { Fac_AOCECurrency, "Fac_AOCECurrency" },
      { Fac_AOCEChargingUnit, "Fac_AOCEChargingUnit" },

      { Fac_StatusRequest, "Fac_StatusRequest" },

      { Fac_CallInfoRetain, "Fac_CallInfoRetain" },
      { Fac_EraseCallLinkageID, "Fac_EraseCallLinkageID" },
      { Fac_CCBSDeactivate, "Fac_CCBSDeactivate" },
      { Fac_CCBSErase, "Fac_CCBSErase" },
      { Fac_CCBSRemoteUserFree, "Fac_CCBSRemoteUserFree" },
      { Fac_CCBSCall, "Fac_CCBSCall" },
      { Fac_CCBSStatusRequest, "Fac_CCBSStatusRequest" },
      { Fac_CCBSBFree, "Fac_CCBSBFree" },
      { Fac_CCBSStopAlerting, "Fac_CCBSStopAlerting" },

      { Fac_CCBSRequest, "Fac_CCBSRequest" },
      { Fac_CCBSInterrogate, "Fac_CCBSInterrogate" },

      { Fac_CCNRRequest, "Fac_CCNRRequest" },
      { Fac_CCNRInterrogate, "Fac_CCNRInterrogate" },

      { Fac_CCBS_T_Call, "Fac_CCBS_T_Call" },
      { Fac_CCBS_T_Suspend, "Fac_CCBS_T_Suspend" },
      { Fac_CCBS_T_Resume, "Fac_CCBS_T_Resume" },
      { Fac_CCBS_T_RemoteUserFree, "Fac_CCBS_T_RemoteUserFree" },
      { Fac_CCBS_T_Available, "Fac_CCBS_T_Available" },

      { Fac_CCBS_T_Request, "Fac_CCBS_T_Request" },

      { Fac_CCNR_T_Request, "Fac_CCNR_T_Request" },

#else

      { Fac_CFActivate, "Fac_CFActivate" },
      { Fac_CFDeactivate, "Fac_CFDeactivate" },
      { Fac_CD, "Fac_CD" },

      { Fac_AOCDCurrency, "Fac_AOCDCurrency" },
      { Fac_AOCDChargingUnit, "Fac_AOCDChargingUnit" },
#endif   /* defined(AST_MISDN_ENHANCEMENTS) */
/* *INDENT-ON* */
   };

   unsigned index;

   for (index = 0; index < ARRAY_LEN(arr); ++index) {
      if (arr[index].facility == facility) {
         return arr[index].name;
      }
   }

   return "unknown";
}

void misdn_lib_log_ies(struct misdn_bchannel *bc)
{
   struct misdn_stack *stack;

   if (!bc) return;

   stack = get_stack_by_bc(bc);

   if (!stack) return;

   cb_log(2, stack->port,
      " --> channel:%d mode:%s cause:%d ocause:%d\n",
      bc->channel,
      stack->nt ? "NT" : "TE",
      bc->cause,
      bc->out_cause);

   cb_log(2, stack->port,
      " --> info_dad:%s dialed numtype:%d plan:%d\n",
      bc->info_dad,
      bc->dialed.number_type,
      bc->dialed.number_plan);

   cb_log(2, stack->port,
      " --> caller:\"%s\" <%s> type:%d plan:%d pres:%d screen:%d\n",
      bc->caller.name,
      bc->caller.number,
      bc->caller.number_type,
      bc->caller.number_plan,
      bc->caller.presentation,
      bc->caller.screening);

   cb_log(2, stack->port,
      " --> redirecting-from:\"%s\" <%s> type:%d plan:%d pres:%d screen:%d\n",
      bc->redirecting.from.name,
      bc->redirecting.from.number,
      bc->redirecting.from.number_type,
      bc->redirecting.from.number_plan,
      bc->redirecting.from.presentation,
      bc->redirecting.from.screening);
   cb_log(2, stack->port,
      " --> redirecting-to:\"%s\" <%s> type:%d plan:%d pres:%d screen:%d\n",
      bc->redirecting.to.name,
      bc->redirecting.to.number,
      bc->redirecting.to.number_type,
      bc->redirecting.to.number_plan,
      bc->redirecting.to.presentation,
      bc->redirecting.to.screening);
   cb_log(2, stack->port,
      " --> redirecting reason:%d count:%d\n",
      bc->redirecting.reason,
      bc->redirecting.count);

   cb_log(2, stack->port,
      " --> connected:\"%s\" <%s> type:%d plan:%d pres:%d screen:%d\n",
      bc->connected.name,
      bc->connected.number,
      bc->connected.number_type,
      bc->connected.number_plan,
      bc->connected.presentation,
      bc->connected.screening);

   cb_log(3, stack->port, " --> caps:%s pi:%x keypad:%s sending_complete:%d\n", bearer2str(bc->capability),bc->progress_indicator, bc->keypad, bc->sending_complete);

   cb_log(4, stack->port, " --> set_pres:%d pres:%d\n", bc->set_presentation, bc->presentation);

   cb_log(4, stack->port, " --> addr:%x l3id:%x b_stid:%x layer_id:%x\n", bc->addr, bc->l3_id, bc->b_stid, bc->layer_id);

   cb_log(4, stack->port, " --> facility in:%s out:%s\n", fac2str(bc->fac_in.Function), fac2str(bc->fac_out.Function));

   cb_log(5, stack->port, " --> urate:%d rate:%d mode:%d user1:%d\n", bc->urate, bc->rate, bc->mode,bc->user1);

   cb_log(5, stack->port, " --> bc:%p h:%d sh:%d\n", bc, bc->holded, bc->stack_holder);
}


#define RETURN(a,b) {retval=a; goto b;}

static void misdn_send_lock(struct misdn_bchannel *bc)
{
   //cb_log(0,bc->port,"Locking bc->pid:%d\n", bc->pid);
   if (bc->send_lock)
      pthread_mutex_lock(&bc->send_lock->lock);
}

static void misdn_send_unlock(struct misdn_bchannel *bc)
{
   //cb_log(0,bc->port,"UnLocking bc->pid:%d\n", bc->pid);
   if (bc->send_lock)
      pthread_mutex_unlock(&bc->send_lock->lock);
}

int misdn_lib_send_event(struct misdn_bchannel *bc, enum event_e event )
{
   msg_t *msg;
   struct misdn_bchannel *bc2;
   struct misdn_bchannel *held_bc;
   struct misdn_stack *stack;
   int retval = 0;
   int channel;
   int tmpcause;
   int tmp_out_cause;

   if (!bc)
      RETURN(-1,OUT_POST_UNLOCK);

   stack = get_stack_by_bc(bc);
   if (!stack) {
      cb_log(0,bc->port,
         "SENDEVENT: no Stack for event:%s caller:\"%s\" <%s> dialed:%s \n",
         isdn_get_info(msgs_g, event, 0),
         bc->caller.name,
         bc->caller.number,
         bc->dialed.number);
      RETURN(-1,OUT);
   }

   misdn_send_lock(bc);


   cb_log(6,stack->port,"SENDEVENT: stack->nt:%d stack->upperid:%x\n",stack->nt, stack->upper_id);

   if ( stack->nt && !stack->l1link) {
      /** Queue Event **/
      bc->evq=event;
      cb_log(1, stack->port, "Queueing Event %s because L1 is down (btw. Activating L1)\n", isdn_get_info(msgs_g, event, 0));
      misdn_lib_get_l1_up(stack);
      RETURN(0,OUT);
   }

   cb_log(1, stack->port,
      "I SEND:%s caller:\"%s\" <%s> dialed:%s pid:%d\n",
      isdn_get_info(msgs_g, event, 0),
      bc->caller.name,
      bc->caller.number,
      bc->dialed.number,
      bc->pid);
   cb_log(4, stack->port, " --> bc_state:%s\n",bc_state2str(bc->bc_state));
   misdn_lib_log_ies(bc);

   switch (event) {
   case EVENT_REGISTER:
   case EVENT_SETUP:
      if (create_process(glob_mgr->midev, bc) < 0) {
         cb_log(0, stack->port, " No free channel at the moment @ send_event\n");

         RETURN(-ENOCHAN,OUT);
      }
      break;

   case EVENT_PROGRESS:
   case EVENT_ALERTING:
   case EVENT_PROCEEDING:
   case EVENT_SETUP_ACKNOWLEDGE:
   case EVENT_CONNECT:
      if (!stack->nt)
         break;

   case EVENT_RETRIEVE_ACKNOWLEDGE:
      if (stack->nt) {
         if (bc->channel <=0 ) { /*  else we have the channel already */
            if (find_free_chan_in_stack(stack, bc, 0, 0)<0) {
               cb_log(0, stack->port, " No free channel at the moment\n");
               /*FIXME: add disconnect*/
               RETURN(-ENOCHAN,OUT);
            }
         }
         /* Its that i generate channels */
      }

      retval=setup_bc(bc);
      if (retval == -EINVAL) {
         cb_log(0,bc->port,"send_event: setup_bc failed\n");
      }

      if (misdn_cap_is_speech(bc->capability)) {
         if ((event==EVENT_CONNECT)||(event==EVENT_RETRIEVE_ACKNOWLEDGE)) {
            if ( *bc->crypt_key ) {
               cb_log(4, stack->port,
                  " --> ENABLING BLOWFISH channel:%d caller%d:\"%s\" <%s> dialed%d:%s\n",
                  bc->channel,
                  bc->caller.number_type,
                  bc->caller.name,
                  bc->caller.number,
                  bc->dialed.number_type,
                  bc->dialed.number);

               manager_ph_control_block(bc,  BF_ENABLE_KEY, bc->crypt_key, strlen(bc->crypt_key) );
            }

            if (!bc->nodsp) manager_ph_control(bc,  DTMF_TONE_START, 0);
            manager_ec_enable(bc);

            if (bc->txgain != 0) {
               cb_log(4, stack->port,  "--> Changing txgain to %d\n", bc->txgain);
               manager_ph_control(bc, VOL_CHANGE_TX, bc->txgain);
            }

            if ( bc->rxgain != 0 ) {
               cb_log(4, stack->port,  "--> Changing rxgain to %d\n", bc->rxgain);
               manager_ph_control(bc, VOL_CHANGE_RX, bc->rxgain);
            }
         }
      }
      break;

   case EVENT_HOLD_ACKNOWLEDGE:
      held_bc = malloc(sizeof(struct misdn_bchannel));
      if (!held_bc) {
         cb_log(0, bc->port, "Could not allocate held_bc!!!\n");
         RETURN(-1,OUT);
      }

      /* backup the bc and put it in storage */
      *held_bc = *bc;
      held_bc->holded = 1;
      held_bc->channel = 0;/* A held call does not have a channel anymore. */
      held_bc->channel_preselected = 0;
      held_bc->channel_found = 0;
      bc_state_change(held_bc, BCHAN_CLEANED);
      stack_holder_add(stack, held_bc);

      /* kill the bridge and clean the real b-channel record */
      if (stack->nt) {
         if (bc->bc_state == BCHAN_BRIDGED) {
            misdn_split_conf(bc,bc->conf_id);
            bc2 = find_bc_by_confid(bc->conf_id);
            if (!bc2) {
               cb_log(0,bc->port,"We have no second bc in bridge???\n");
            } else {
               misdn_split_conf(bc2,bc->conf_id);
            }
         }

         channel = bc->channel;

         empty_bc(bc);
         clean_up_bc(bc);

         if (channel>0)
            empty_chan_in_stack(stack,channel);

         bc->in_use=0;
      }
      break;

   /* finishing the channel eh ? */
   case EVENT_DISCONNECT:
      if (!bc->need_disconnect) {
         cb_log(0, bc->port, " --> we have already sent DISCONNECT\n");
         RETURN(-1,OUT);
      }

      bc->need_disconnect=0;
      break;
   case EVENT_RELEASE:
      if (!bc->need_release) {
         cb_log(0, bc->port, " --> we have already sent RELEASE\n");
         RETURN(-1,OUT);
      }
      bc->need_disconnect=0;
      bc->need_release=0;
      break;
   case EVENT_RELEASE_COMPLETE:
      if (!bc->need_release_complete) {
         cb_log(0, bc->port, " --> we have already sent RELEASE_COMPLETE\n");
         RETURN(-1,OUT);
      }
      bc->need_disconnect=0;
      bc->need_release=0;
      bc->need_release_complete=0;

      if (!stack->nt) {
         /* create cleanup in TE */
         channel = bc->channel;
         tmpcause = bc->cause;
         tmp_out_cause = bc->out_cause;

         empty_bc(bc);
         bc->cause=tmpcause;
         bc->out_cause=tmp_out_cause;
         clean_up_bc(bc);

         if (channel>0)
            empty_chan_in_stack(stack,channel);

         bc->in_use=0;
      }
      break;

   case EVENT_CONNECT_ACKNOWLEDGE:
      if ( bc->nt || misdn_cap_is_speech(bc->capability)) {
         int retval=setup_bc(bc);
         if (retval == -EINVAL){
            cb_log(0,bc->port,"send_event: setup_bc failed\n");

         }
      }

      if (misdn_cap_is_speech(bc->capability)) {
         if (  !bc->nodsp) manager_ph_control(bc,  DTMF_TONE_START, 0);
         manager_ec_enable(bc);

         if ( bc->txgain != 0 ) {
            cb_log(4, stack->port, "--> Changing txgain to %d\n", bc->txgain);
            manager_ph_control(bc, VOL_CHANGE_TX, bc->txgain);
         }
         if ( bc->rxgain != 0 ) {
            cb_log(4, stack->port, "--> Changing rxgain to %d\n", bc->rxgain);
            manager_ph_control(bc, VOL_CHANGE_RX, bc->rxgain);
         }
      }
      break;

   default:
      break;
   }

   /* Later we should think about sending bchannel data directly to misdn. */
   msg = isdn_msg_build_event(msgs_g, bc, event, stack->nt);
   if (!msg) {
      /*
       * The message was not built.
       *
       * NOTE:  The only time that the message will fail to build
       * is because the requested FACILITY message is not supported.
       * A failed malloc() results in exit() being called.
       */
      RETURN(-1, OUT);
   } else {
      msg_queue_tail(&stack->downqueue, msg);
      sem_post(&glob_mgr->new_msg);
   }

OUT:
   misdn_send_unlock(bc);

OUT_POST_UNLOCK:
   return retval;
}


static int handle_err(msg_t *msg)
{
   iframe_t *frm = (iframe_t*) msg->data;


   if (!frm->addr) {
      static int cnt=0;
      if (!cnt)
         cb_log(0,0,"mISDN Msg without Address pr:%x dinfo:%x\n",frm->prim,frm->dinfo);
      cnt++;
      if (cnt>100) {
         cb_log(0,0,"mISDN Msg without Address pr:%x dinfo:%x (already more than 100 of them)\n",frm->prim,frm->dinfo);
         cnt=0;
      }

      free_msg(msg);
      return 1;

   }

   switch (frm->prim) {
      case MGR_SETSTACK|INDICATION:
         return handle_bchan(msg);
      break;

      case MGR_SETSTACK|CONFIRM:
      case MGR_CLEARSTACK|CONFIRM:
         free_msg(msg) ;
         return 1;
      break;

      case DL_DATA|CONFIRM:
         cb_log(4,0,"DL_DATA|CONFIRM\n");
         free_msg(msg);
         return 1;

      case PH_CONTROL|CONFIRM:
         cb_log(4,0,"PH_CONTROL|CONFIRM\n");
         free_msg(msg);
         return 1;

      case DL_DATA|INDICATION:
      {
         int port=(frm->addr&MASTER_ID_MASK) >> 8;
         int channel=(frm->addr&CHILD_ID_MASK) >> 16;
         struct misdn_bchannel *bc;

         /*we flush the read buffer here*/

         cb_log(9,0,"BCHAN DATA without BC: addr:%x port:%d channel:%d\n",frm->addr, port,channel);

         free_msg(msg);
         return 1;


         bc = find_bc_by_channel(port, channel);

         if (!bc) {
            struct misdn_stack *stack = find_stack_by_port(port);

            if (!stack) {
               cb_log(0,0," --> stack not found\n");
               free_msg(msg);
               return 1;
            }

            cb_log(0,0," --> bc not found by channel\n");
            if (stack->l2link)
               misdn_lib_get_l2_down(stack);

            if (stack->l1link)
               misdn_lib_get_l1_down(stack);

            free_msg(msg);
            return 1;
         }

         cb_log(3,port," --> BC in state:%s\n", bc_state2str(bc->bc_state));
      }
   }

   return 0;
}

#if 0
static int queue_l2l3(msg_t *msg)
{
   iframe_t *frm= (iframe_t*)msg->data;
   struct misdn_stack *stack;
   stack=find_stack_by_addr( frm->addr );


   if (!stack) {
      return 0;
   }

   msg_queue_tail(&stack->upqueue, msg);
   sem_post(&glob_mgr->new_msg);
   return 1;
}
#endif

int manager_isdn_handler(iframe_t *frm ,msg_t *msg)
{

   if (frm->dinfo==0xffffffff && frm->prim==(PH_DATA|CONFIRM)) {
      cb_log(0,0,"SERIOUS BUG, dinfo == 0xffffffff, prim == PH_DATA | CONFIRM !!!!\n");
   }

   if ( ((frm->addr | ISDN_PID_BCHANNEL_BIT )>> 28 ) == 0x5) {
      static int unhandled_bmsg_count=1000;
      if (handle_bchan(msg)) {
         return 0 ;
      }

      if (unhandled_bmsg_count==1000) {
         cb_log(0, 0, "received 1k Unhandled Bchannel Messages: prim %x len %d from addr %x, dinfo %x on this port.\n",frm->prim, frm->len, frm->addr, frm->dinfo);
         unhandled_bmsg_count=0;
      }

      unhandled_bmsg_count++;
      free_msg(msg);
      return 0;
   }

#ifdef RECV_FRM_SYSLOG_DEBUG
   syslog(LOG_NOTICE,"mISDN recv: P(%02d): ADDR:%x PRIM:%x DINFO:%x\n",stack->port, frm->addr, frm->prim, frm->dinfo);
#endif

   if (handle_timers(msg))
      return 0 ;


   if (handle_mgmt(msg))
      return 0 ;

   if (handle_l2(msg))
      return 0 ;

   /* Its important to handle l1 AFTER l2  */
   if (handle_l1(msg))
      return 0 ;

   if (handle_frm_nt(msg)) {
      return 0;
   }

   if (handle_frm(msg)) {
      return 0;
   }

   if (handle_err(msg)) {
      return 0 ;
   }

   cb_log(0, 0, "Unhandled Message: prim %x len %d from addr %x, dinfo %x on this port.\n",frm->prim, frm->len, frm->addr, frm->dinfo);
   free_msg(msg);


   return 0;
}




int misdn_lib_get_port_info(int port)
{
   msg_t *msg=alloc_msg(MAX_MSG_SIZE);
   iframe_t *frm;
   struct misdn_stack *stack=find_stack_by_port(port);
   if (!msg) {
      cb_log(0, port, "misdn_lib_get_port_info: alloc_msg failed!\n");
      return -1;
   }
   frm=(iframe_t*)msg->data;
   if (!stack ) {
      cb_log(0, port, "There is no Stack for this port.\n");
      return -1;
   }
   /* activate bchannel */
   frm->prim = CC_STATUS_ENQUIRY | REQUEST;

   frm->addr = stack->upper_id| FLG_MSG_DOWN;

   frm->dinfo = 0;
   frm->len = 0;

   msg_queue_tail(&glob_mgr->activatequeue, msg);
   sem_post(&glob_mgr->new_msg);


   return 0;
}


int queue_cleanup_bc(struct misdn_bchannel *bc)
{
   msg_t *msg=alloc_msg(MAX_MSG_SIZE);
   iframe_t *frm;
   if (!msg) {
      cb_log(0, bc->port, "queue_cleanup_bc: alloc_msg failed!\n");
      return -1;
   }
   frm=(iframe_t*)msg->data;

   /* activate bchannel */
   frm->prim = MGR_CLEARSTACK| REQUEST;

   frm->addr = bc->l3_id;

   frm->dinfo = bc->port;
   frm->len = 0;

   msg_queue_tail(&glob_mgr->activatequeue, msg);
   sem_post(&glob_mgr->new_msg);

   return 0;

}

int misdn_lib_pid_restart(int pid)
{
   struct misdn_bchannel *bc=manager_find_bc_by_pid(pid);

   if (bc) {
      manager_clean_bc(bc);
   }
   return 0;
}

/*Sends Restart message for every bchannel*/
int misdn_lib_send_restart(int port, int channel)
{
   struct misdn_stack *stack=find_stack_by_port(port);
   struct misdn_bchannel dummybc;
   /*default is all channels*/
   cb_log(0, port, "Sending Restarts on this port.\n");

   misdn_make_dummy(&dummybc, stack->port, MISDN_ID_GLOBAL, stack->nt, 0);

   /*default is all channels*/
   if (channel <0) {
      dummybc.channel=-1;
      cb_log(0, port, "Restarting and all Interfaces\n");
      misdn_lib_send_event(&dummybc, EVENT_RESTART);

      return 0;
   }

   /*if a channel is specified we restart only this one*/
   if (channel >0) {
      int cnt;
      dummybc.channel=channel;
      cb_log(0, port, "Restarting and cleaning channel %d\n",channel);
      misdn_lib_send_event(&dummybc, EVENT_RESTART);
      /* clean up chan in stack, to be sure we don't think it's
       * in use anymore */
      for (cnt=0; cnt<=stack->b_num; cnt++) {
         if (stack->bc[cnt].in_use && stack->bc[cnt].channel == channel) {
            empty_bc(&stack->bc[cnt]);
            clean_up_bc(&stack->bc[cnt]);
            stack->bc[cnt].in_use=0;
         }
      }
   }

   return 0;
}

/*reinitializes the L2/L3*/
int misdn_lib_port_restart(int port)
{
   struct misdn_stack *stack=find_stack_by_port(port);

   cb_log(0, port, "Restarting this port.\n");
   if (stack) {
      cb_log(0, port, "Stack:%p\n",stack);

      clear_l3(stack);
      {
         msg_t *msg=alloc_msg(MAX_MSG_SIZE);
         iframe_t *frm;

         if (!msg) {
            cb_log(0, port, "port_restart: alloc_msg failed\n");
            return -1;
         }

         frm=(iframe_t*)msg->data;
         /* we must activate if we are deactivated */
         /* activate bchannel */
         frm->prim = DL_RELEASE | REQUEST;
         frm->addr = stack->upper_id | FLG_MSG_DOWN;

         frm->dinfo = 0;
         frm->len = 0;
         msg_queue_tail(&glob_mgr->activatequeue, msg);
         sem_post(&glob_mgr->new_msg);
      }

      if (stack->nt)
         misdn_lib_reinit_nt_stack(stack->port);

   }

   return 0;
}



static sem_t handler_started;

/* This is a thread */
static void manager_event_handler(void *arg)
{
   sem_post(&handler_started);
   while (1) {
      struct misdn_stack *stack;
      msg_t *msg;

      /** wait for events **/
      sem_wait(&glob_mgr->new_msg);

      for (msg=msg_dequeue(&glob_mgr->activatequeue);
           msg;
           msg=msg_dequeue(&glob_mgr->activatequeue)
         )
      {

         iframe_t *frm =  (iframe_t*) msg->data ;

         switch ( frm->prim) {

         case MGR_CLEARSTACK | REQUEST:
            /*a queued bchannel cleanup*/
            {
               struct misdn_stack *stack=find_stack_by_port(frm->dinfo);
               struct misdn_bchannel *bc;
               if (!stack) {
                  cb_log(0,0,"no stack found with port [%d]!! so we cannot cleanup the bc\n",frm->dinfo);
                  free_msg(msg);
                  break;
               }

               bc = find_bc_by_l3id(stack, frm->addr);
               if (bc) {
                  cb_log(1,bc->port,"CLEARSTACK queued, cleaning up\n");
                  clean_up_bc(bc);
               } else {
                  cb_log(0,stack->port,"bc could not be cleaned correctly !! addr [%x]\n",frm->addr);
               }
            }
            free_msg(msg);
            break;
         case MGR_SETSTACK | REQUEST :
            free_msg(msg);
            break;
         default:
            mISDN_write(glob_mgr->midev, frm, mISDN_HEADER_LEN+frm->len, TIMEOUT_1SEC);
            free_msg(msg);
         }
      }

      for (stack=glob_mgr->stack_list;
           stack;
           stack=stack->next ) {

         while ( (msg=msg_dequeue(&stack->upqueue)) ) {
            /** Handle L2/3 Signalling after bchans **/
            if (!handle_frm_nt(msg)) {
               /* Maybe it's TE */
               if (!handle_frm(msg)) {
                  /* wow none! */
                  cb_log(0,stack->port,"Wow we've got a strange issue while dequeueing a Frame\n");
               }
            }
         }

         /* Here we should check if we really want to
            send all the messages we've queued, lets
            assume we've queued a Disconnect, but
            received it already from the other side!*/

         while ( (msg=msg_dequeue(&stack->downqueue)) ) {
            if (stack->nt ) {
               pthread_mutex_lock(&stack->nstlock);
               if (stack->nst.manager_l3(&stack->nst, msg))
                  cb_log(0, stack->port, "Error@ Sending Message in NT-Stack.\n");
               pthread_mutex_unlock(&stack->nstlock);
            } else {
               iframe_t *frm = (iframe_t *)msg->data;
               struct misdn_bchannel *bc = find_bc_by_l3id(stack, frm->dinfo);
               if (bc)
                  send_msg(glob_mgr->midev, bc, msg);
               else  {
                  if (frm->dinfo == MISDN_ID_GLOBAL || frm->dinfo == MISDN_ID_DUMMY ) {
                     struct misdn_bchannel dummybc;
                     cb_log(5,0," --> GLOBAL/DUMMY\n");
                     misdn_make_dummy(&dummybc, stack->port, frm->dinfo, stack->nt, 0);
                     send_msg(glob_mgr->midev, &dummybc, msg);
                  } else {
                     cb_log(0,0,"No bc for Message\n");
                  }
               }
            }
         }
      }
   }
}


int misdn_lib_maxports_get(void)
{
   /* BE AWARE WE HAVE NO cb_log() HERE! */

   int i = mISDN_open();
   int max=0;

   if (i<0)
      return -1;

   max = mISDN_get_stack_count(i);

   mISDN_close(i);

   return max;
}


void misdn_lib_nt_keepcalls( int kc)
{
#ifdef FEATURE_NET_KEEPCALLS
   if (kc) {
      struct misdn_stack *stack=get_misdn_stack();
      for ( ; stack; stack=stack->next) {
         stack->nst.feature |= FEATURE_NET_KEEPCALLS;
      }
   }
#endif
}

void misdn_lib_nt_debug_init( int flags, char *file )
{
   static int init=0;
   char *f;

   if (!flags)
      f=NULL;
   else
      f=file;

   if (!init) {
      debug_init( flags , f, f, f);
      init=1;
   } else {
      debug_close();
      debug_init( flags , f, f, f);
   }
}

int misdn_lib_init(char *portlist, struct misdn_lib_iface *iface, void *user_data)
{
   struct misdn_lib *mgr=calloc(1, sizeof(struct misdn_lib));
   char *tok, *tokb;
   char plist[1024];
   int midev;
   int port_count=0;

   cb_log = iface->cb_log;
   cb_event = iface->cb_event;
   cb_jb_empty = iface->cb_jb_empty;

   glob_mgr = mgr;

   msg_init();

   misdn_lib_nt_debug_init(0,NULL);

   if (!portlist || (*portlist == 0) ) return 1;

   init_flip_bits();

   {
      strncpy(plist,portlist, 1024);
      plist[1023] = 0;
   }

   memcpy(tone_425_flip,tone_425,TONE_425_SIZE);
   flip_buf_bits(tone_425_flip,TONE_425_SIZE);

   memcpy(tone_silence_flip,tone_SILENCE,TONE_SILENCE_SIZE);
   flip_buf_bits(tone_silence_flip,TONE_SILENCE_SIZE);

   midev=te_lib_init();
   mgr->midev=midev;

   port_count=mISDN_get_stack_count(midev);

   msg_queue_init(&mgr->activatequeue);

   if (sem_init(&mgr->new_msg, 1, 0)<0)
      sem_init(&mgr->new_msg, 0, 0);

   for (tok=strtok_r(plist," ,",&tokb );
        tok;
        tok=strtok_r(NULL," ,",&tokb)) {
      int port = atoi(tok);
      struct misdn_stack *stack;
      struct misdn_stack *help;
      int ptp=0;
      int i;
      int r;

      if (strstr(tok, "ptp"))
         ptp=1;

      if (port > port_count) {
         cb_log(0, port, "Couldn't Initialize this port since we have only %d ports\n", port_count);
         exit(1);
      }

      stack = stack_init(midev, port, ptp);
      if (!stack) {
         perror("stack_init");
         exit(1);
      }

      /* Initialize the B channel records for real B channels. */
      for (i = 0; i <= stack->b_num; i++) {
         r = init_bc(stack, &stack->bc[i], stack->midev, port, i);
         if (r < 0) {
            cb_log(0, port, "Got Err @ init_bc :%d\n", r);
            exit(1);
         }
      }
#if defined(AST_MISDN_ENHANCEMENTS)
      /* Initialize the B channel records for REGISTER signaling links. */
      for (i = MAX_BCHANS + 1; i < ARRAY_LEN(stack->bc); ++i) {
         r = init_bc(stack, &stack->bc[i], stack->midev, port, i);
         if (r < 0) {
            cb_log(0, port, "Got Err @ init_bc :%d\n", r);
            exit(1);
         }
         stack->bc[i].is_register_pool = 1;
      }
#endif   /* defined(AST_MISDN_ENHANCEMENTS) */

      /* Add the new stack to the end of the list */
      help = mgr->stack_list;
      if (!help) {
         mgr->stack_list = stack;
      } else {
         while (help->next) {
            help = help->next;
         }
         help->next = stack;
      }
   }

   if (sem_init(&handler_started, 1, 0)<0)
      sem_init(&handler_started, 0, 0);

   cb_log(8, 0, "Starting Event Handler\n");
   pthread_create( &mgr->event_handler_thread, NULL,(void*)manager_event_handler, mgr);

   sem_wait(&handler_started) ;
   cb_log(8, 0, "Starting Event Catcher\n");
   pthread_create( &mgr->event_thread, NULL, (void*)misdn_lib_isdn_event_catcher, mgr);

   cb_log(8, 0, "Event Catcher started\n");

   global_state= MISDN_INITIALIZED;

   return (mgr == NULL);
}

void misdn_lib_destroy(void)
{
   struct misdn_stack *help;
   int i;

   for ( help=glob_mgr->stack_list; help; help=help->next ) {
      for(i=0;i<=help->b_num; i++) {
         char buf[1024];
         mISDN_write_frame(help->midev, buf, help->bc[i].addr, MGR_DELLAYER | REQUEST, 0, 0, NULL, TIMEOUT_1SEC);
         help->bc[i].addr = 0;
      }
      cb_log (1, help->port, "Destroying this port.\n");
      stack_destroy(help);
   }

   if (global_state == MISDN_INITIALIZED) {
      cb_log(4, 0, "Killing Handler Thread\n");
      if ( pthread_cancel(glob_mgr->event_handler_thread) == 0 ) {
         cb_log(4, 0, "Joining Handler Thread\n");
         pthread_join(glob_mgr->event_handler_thread, NULL);
      }

      cb_log(4, 0, "Killing Main Thread\n");
      if ( pthread_cancel(glob_mgr->event_thread) == 0 ) {
         cb_log(4, 0, "Joining Main Thread\n");
         pthread_join(glob_mgr->event_thread, NULL);
      }
   }

   cb_log(1, 0, "Closing mISDN device\n");
   te_lib_destroy(glob_mgr->midev);
}

char *manager_isdn_get_info(enum event_e event)
{
   return isdn_get_info(msgs_g , event, 0);
}

void manager_bchannel_activate(struct misdn_bchannel *bc)
{
   char buf[128];

   struct misdn_stack *stack=get_stack_by_bc(bc);

   if (!stack) {
      cb_log(0, bc->port, "bchannel_activate: Stack not found !");
      return ;
   }

   /* we must activate if we are deactivated */
   clear_ibuffer(bc->astbuf);

   cb_log(5, stack->port, "$$$ Bchan Activated addr %x\n", bc->addr);

   mISDN_write_frame(stack->midev, buf, bc->addr | FLG_MSG_DOWN,  DL_ESTABLISH | REQUEST, 0,0, NULL, TIMEOUT_1SEC);

   return ;
}


void manager_bchannel_deactivate(struct misdn_bchannel * bc)
{
   struct misdn_stack *stack=get_stack_by_bc(bc);
   char buf[128];

   switch (bc->bc_state) {
      case BCHAN_ACTIVATED:
         break;
      case BCHAN_BRIDGED:
         misdn_split_conf(bc,bc->conf_id);
         break;
      default:
         cb_log( 4, bc->port,"bchan_deactivate: called but not activated\n");
         return ;

   }

   cb_log(5, stack->port, "$$$ Bchan deActivated addr %x\n", bc->addr);

   bc->generate_tone=0;

   mISDN_write_frame(stack->midev, buf, bc->addr | FLG_MSG_DOWN, DL_RELEASE|REQUEST,0,0,NULL, TIMEOUT_1SEC);

   clear_ibuffer(bc->astbuf);

   bc_state_change(bc,BCHAN_RELEASE);

   return;
}


int misdn_lib_tx2misdn_frm(struct misdn_bchannel *bc, void *data, int len)
{
   struct misdn_stack *stack=get_stack_by_bc(bc);
   char buf[4096 + mISDN_HEADER_LEN];
   iframe_t *frm = (iframe_t*)buf;

   switch (bc->bc_state) {
      case BCHAN_ACTIVATED:
      case BCHAN_BRIDGED:
         break;
      default:
         cb_log(3, bc->port, "BC not yet activated (state:%s)\n",bc_state2str(bc->bc_state));
         return -1;
   }

   frm->prim = DL_DATA|REQUEST;
   frm->dinfo = 0;
   frm->addr = bc->addr | FLG_MSG_DOWN ;

   frm->len = len;
   memcpy(&buf[mISDN_HEADER_LEN], data,len);

   if ( misdn_cap_is_speech(bc->capability) )
      flip_buf_bits( &buf[mISDN_HEADER_LEN], len);
   else
      cb_log(6, stack->port, "Writing %d data bytes\n",len);

   cb_log(9, stack->port, "Writing %d bytes 2 mISDN\n",len);
   mISDN_write(stack->midev, buf, frm->len + mISDN_HEADER_LEN, TIMEOUT_INFINIT);
   return 0;
}



/*
 * send control information to the channel (dsp-module)
 */
void manager_ph_control(struct misdn_bchannel *bc, int c1, int c2)
{
   unsigned char buffer[mISDN_HEADER_LEN+2*sizeof(int)];
   iframe_t *ctrl = (iframe_t *)buffer; /* preload data */
   unsigned int *d = (unsigned int*)&ctrl->data.p;
   /*struct misdn_stack *stack=get_stack_by_bc(bc);*/

   cb_log(4,bc->port,"ph_control: c1:%x c2:%x\n",c1,c2);

   ctrl->prim = PH_CONTROL | REQUEST;
   ctrl->addr = bc->addr | FLG_MSG_DOWN;
   ctrl->dinfo = 0;
   ctrl->len = sizeof(unsigned int)*2;
   *d++ = c1;
   *d++ = c2;
   mISDN_write(glob_mgr->midev, ctrl, mISDN_HEADER_LEN+ctrl->len, TIMEOUT_1SEC);
}

/*
 * allow live control of channel parameters
 */
void isdn_lib_update_rxgain (struct misdn_bchannel *bc)
{
   manager_ph_control(bc, VOL_CHANGE_RX, bc->rxgain);
}

void isdn_lib_update_txgain (struct misdn_bchannel *bc)
{
   manager_ph_control(bc, VOL_CHANGE_TX, bc->txgain);
}

void isdn_lib_update_ec (struct misdn_bchannel *bc)
{
#ifdef MISDN_1_2
   if (*bc->pipeline)
#else
   if (bc->ec_enable)
#endif
      manager_ec_enable(bc);
   else
      manager_ec_disable(bc);
}

void isdn_lib_stop_dtmf (struct misdn_bchannel *bc)
{
   manager_ph_control(bc, DTMF_TONE_STOP, 0);
}

/*
 * send control information to the channel (dsp-module)
 */
void manager_ph_control_block(struct misdn_bchannel *bc, int c1, void *c2, int c2_len)
{
   unsigned char buffer[mISDN_HEADER_LEN+sizeof(int)+c2_len];
   iframe_t *ctrl = (iframe_t *)buffer;
   unsigned int *d = (unsigned int *)&ctrl->data.p;
   /*struct misdn_stack *stack=get_stack_by_bc(bc);*/

   ctrl->prim = PH_CONTROL | REQUEST;
   ctrl->addr = bc->addr | FLG_MSG_DOWN;
   ctrl->dinfo = 0;
   ctrl->len = sizeof(unsigned int) + c2_len;
   *d++ = c1;
   memcpy(d, c2, c2_len);
   mISDN_write(glob_mgr->midev, ctrl, mISDN_HEADER_LEN+ctrl->len, TIMEOUT_1SEC);
}




void manager_clean_bc(struct misdn_bchannel *bc )
{
   struct misdn_stack *stack=get_stack_by_bc(bc);

   if (stack && bc->channel > 0) {
      empty_chan_in_stack(stack, bc->channel);
   }
   empty_bc(bc);
   bc->in_use=0;

   cb_event(EVENT_CLEANUP, bc, NULL);
}


void stack_holder_add(struct misdn_stack *stack, struct misdn_bchannel *holder)
{
   struct misdn_bchannel *help;
   cb_log(4,stack->port, "*HOLDER: add %x\n",holder->l3_id);

   holder->stack_holder=1;
   holder->next=NULL;

   if (!stack->holding) {
      stack->holding = holder;
      return;
   }

   for (help=stack->holding;
        help;
        help=help->next) {
      if (!help->next) {
         help->next=holder;
         break;
      }
   }

}

void stack_holder_remove(struct misdn_stack *stack, struct misdn_bchannel *holder)
{
   struct misdn_bchannel *h1;

   if (!holder->stack_holder) return;

   holder->stack_holder=0;

   cb_log(4,stack->port, "*HOLDER: remove %x\n",holder->l3_id);
   if (!stack || ! stack->holding) return;

   if (holder == stack->holding) {
      stack->holding = stack->holding->next;
      return;
   }

   for (h1=stack->holding;
        h1;
        h1=h1->next) {
      if (h1->next == holder) {
         h1->next=h1->next->next;
         return ;
      }
   }
}

struct misdn_bchannel *stack_holder_find(struct misdn_stack *stack, unsigned long l3id)
{
   struct misdn_bchannel *help;

   cb_log(4,stack?stack->port:0, "*HOLDER: find %lx\n",l3id);

   if (!stack) return NULL;

   for (help=stack->holding;
        help;
        help=help->next) {
      if (help->l3_id == l3id) {
         cb_log(4,stack->port, "*HOLDER: found bc\n");
         return help;
      }
   }

   cb_log(4,stack->port, "*HOLDER: find nothing\n");
   return NULL;
}

/*!
 * \brief Find a held call's B channel record.
 *
 * \param port Port the call is on.
 * \param l3_id mISDN Layer 3 ID of held call.
 *
 * \return Found bc-record or NULL.
 */
struct misdn_bchannel *misdn_lib_find_held_bc(int port, int l3_id)
{
   struct misdn_bchannel *bc;
   struct misdn_stack *stack;

   bc = NULL;
   for (stack = get_misdn_stack(); stack; stack = stack->next) {
      if (stack->port == port) {
         bc = stack_holder_find(stack, l3_id);
         break;
      }
   }

   return bc;
}

void misdn_lib_send_tone(struct misdn_bchannel *bc, enum tone_e tone)
{
   char buf[mISDN_HEADER_LEN + 128] = "";
   iframe_t *frm = (iframe_t*)buf;

   switch(tone) {
   case TONE_DIAL:
      manager_ph_control(bc, TONE_PATT_ON, TONE_GERMAN_DIALTONE);
   break;

   case TONE_ALERTING:
      manager_ph_control(bc, TONE_PATT_ON, TONE_GERMAN_RINGING);
   break;

   case TONE_HANGUP:
      manager_ph_control(bc, TONE_PATT_ON, TONE_GERMAN_HANGUP);
   break;

   case TONE_NONE:
   default:
      manager_ph_control(bc, TONE_PATT_OFF, TONE_GERMAN_HANGUP);
   }

   frm->prim=DL_DATA|REQUEST;
   frm->addr=bc->addr|FLG_MSG_DOWN;
   frm->dinfo=0;
   frm->len=128;

   mISDN_write(glob_mgr->midev, frm, mISDN_HEADER_LEN+frm->len, TIMEOUT_1SEC);
}


void manager_ec_enable(struct misdn_bchannel *bc)
{
   struct misdn_stack *stack=get_stack_by_bc(bc);

   cb_log(4, stack?stack->port:0,"ec_enable\n");

   if (!misdn_cap_is_speech(bc->capability)) {
      cb_log(1, stack?stack->port:0, " --> no speech? cannot enable EC\n");
   } else {

#ifdef MISDN_1_2
   if (*bc->pipeline) {
      cb_log(3, stack?stack->port:0,"Sending Control PIPELINE_CFG %s\n",bc->pipeline);
      manager_ph_control_block(bc, PIPELINE_CFG, bc->pipeline, strlen(bc->pipeline) + 1);
   }
#else
   int ec_arr[2];

   if (bc->ec_enable) {
      cb_log(3, stack?stack->port:0,"Sending Control ECHOCAN_ON taps:%d\n",bc->ec_deftaps);

      switch (bc->ec_deftaps) {
      case 4:
      case 8:
      case 16:
      case 32:
      case 64:
      case 128:
      case 256:
      case 512:
      case 1024:
         cb_log(4, stack->port, "Taps is %d\n",bc->ec_deftaps);
         break;
      default:
         cb_log(0, stack->port, "Taps should be power of 2\n");
         bc->ec_deftaps=128;
      }

      ec_arr[0]=bc->ec_deftaps;
      ec_arr[1]=0;

      manager_ph_control_block(bc,  ECHOCAN_ON,  ec_arr, sizeof(ec_arr));
   }
#endif
   }
}



void manager_ec_disable(struct misdn_bchannel *bc)
{
   struct misdn_stack *stack=get_stack_by_bc(bc);

   cb_log(4, stack?stack->port:0," --> ec_disable\n");

   if (!misdn_cap_is_speech(bc->capability)) {
      cb_log(1, stack?stack->port:0, " --> no speech? cannot disable EC\n");
      return;
   }

#ifdef MISDN_1_2
   manager_ph_control_block(bc, PIPELINE_CFG, "", 0);
#else
   if ( ! bc->ec_enable) {
      cb_log(3, stack?stack->port:0, "Sending Control ECHOCAN_OFF\n");
      manager_ph_control(bc,  ECHOCAN_OFF, 0);
   }
#endif
}

struct misdn_stack *get_misdn_stack(void)
{
   return glob_mgr->stack_list;
}



void misdn_join_conf(struct misdn_bchannel *bc, int conf_id)
{
   char data[16] = "";

   bc_state_change(bc,BCHAN_BRIDGED);
   manager_ph_control(bc, CMX_RECEIVE_OFF, 0);
   manager_ph_control(bc, CMX_CONF_JOIN, conf_id);

   cb_log(3,bc->port, "Joining bc:%x in conf:%d\n",bc->addr,conf_id);

   misdn_lib_tx2misdn_frm(bc, data, sizeof(data) - 1);
}


void misdn_split_conf(struct misdn_bchannel *bc, int conf_id)
{
   bc_state_change(bc,BCHAN_ACTIVATED);
   manager_ph_control(bc, CMX_RECEIVE_ON, 0);
   manager_ph_control(bc, CMX_CONF_SPLIT, conf_id);

   cb_log(4,bc->port, "Splitting bc:%x in conf:%d\n",bc->addr,conf_id);
}

void misdn_lib_bridge( struct misdn_bchannel * bc1, struct misdn_bchannel *bc2)
{
   int conf_id = bc1->pid + 1;
   struct misdn_bchannel *bc_list[] = { bc1, bc2, NULL };
   struct misdn_bchannel **bc;

   cb_log(4, bc1->port, "I Send: BRIDGE from:%d to:%d\n",bc1->port,bc2->port);

   for (bc=bc_list; *bc;  bc++) {
      (*bc)->conf_id=conf_id;
      cb_log(4, (*bc)->port, " --> bc_addr:%x\n",(*bc)->addr);

      switch((*bc)->bc_state) {
         case BCHAN_ACTIVATED:
            misdn_join_conf(*bc,conf_id);
            break;
         default:
            bc_next_state_change(*bc,BCHAN_BRIDGED);
            break;
      }
   }
}

void misdn_lib_split_bridge( struct misdn_bchannel * bc1, struct misdn_bchannel *bc2)
{

   struct misdn_bchannel *bc_list[]={
      bc1,bc2,NULL
   };
   struct misdn_bchannel **bc;

   for (bc=bc_list; *bc;  bc++) {
      if ( (*bc)->bc_state == BCHAN_BRIDGED){
         misdn_split_conf( *bc, (*bc)->conf_id);
      } else {
         cb_log( 2, (*bc)->port, "BC not bridged (state:%s) so not splitting it\n",bc_state2str((*bc)->bc_state));
      }
   }

}



void misdn_lib_echo(struct misdn_bchannel *bc, int onoff)
{
   cb_log(3,bc->port, " --> ECHO %s\n", onoff?"ON":"OFF");
   manager_ph_control(bc, onoff?CMX_ECHO_ON:CMX_ECHO_OFF, 0);
}



void misdn_lib_reinit_nt_stack(int port)
{
   struct misdn_stack *stack=find_stack_by_port(port);

   if (stack) {
      stack->l2link=0;
      stack->blocked=0;

      cleanup_Isdnl3(&stack->nst);
      cleanup_Isdnl2(&stack->nst);


      memset(&stack->nst, 0, sizeof(net_stack_t));
      memset(&stack->mgr, 0, sizeof(manager_t));

      stack->mgr.nst = &stack->nst;
      stack->nst.manager = &stack->mgr;

      stack->nst.l3_manager = handle_event_nt;
      stack->nst.device = glob_mgr->midev;
      stack->nst.cardnr = port;
      stack->nst.d_stid = stack->d_stid;

      stack->nst.feature = FEATURE_NET_HOLD;
      if (stack->ptp)
         stack->nst.feature |= FEATURE_NET_PTP;
      if (stack->pri)
         stack->nst.feature |= FEATURE_NET_CRLEN2 | FEATURE_NET_EXTCID;

      stack->nst.l1_id = stack->lower_id;
      stack->nst.l2_id = stack->upper_id;

      msg_queue_init(&stack->nst.down_queue);

      Isdnl2Init(&stack->nst);
      Isdnl3Init(&stack->nst);

      if (!stack->ptp)
         misdn_lib_get_l1_up(stack);
      misdn_lib_get_l2_up(stack);
   }
}