Voice Recording and Playback with ISDN
by Martyn Davies

Listing One
WORD fsm[INPUTS][STATES]={
//             IDLE  LISTEN ACTING  PROTB3  ACTB3I  CONN    DISCB3  DISC
//              s0     s1     s2      s3      s4     s5       s6     s7
//--------------------------------------------------------------------------
/*KICKOFF  */{ s1+1,  s1+0,  s2+0,  s3+0,   s4+0,   s5+0,   s6+0,   s7+0,  },
/*CONNI    */{ s0+0,  s2+9,  s2+0,  s3+0,   s4+0,   s5+0,   s6+0,   s7+0,  },
/*CONNACTI */{ s0+0,  s1+0,  s3+2,  s3+0,   s4+0,   s5+0,   s6+0,   s7+0,  },
/*CONNIB3  */{ s0+0,  s1+0,  s2+0,  s4+11,  s4+0,   s5+0,   s6+0,   s7+0,  },
/*ALLACT   */{ s0+0,  s1+0,  s2+0,  s3+0,   s5+3,   s5+0,   s6+0,   s7+0,  },
/*DISCI    */{ s0+0,  s1+0,  s0+12, s0+12,  s0+12,  s0+12,  s0+12,  s0+12, },
/*DISCB3I  */{ s0+0,  s1+0,  s2+0,  s3+0,   s7+10,  s7+10,  s7+10,  s7+10, },
/*TIMER    */{ s0+0,  s1+0,  s2+0,  s7+8,   s7+8,   s5+13,  s6+0,   s7+0,  },
/*DATA_R   */{ s0+0,  s1+0,  s2+0,  s3+0,   s4+0,   s5+5,   s6+0,   s7+0,  },
/*DATA_I   */{ s0+0,  s1+0,  s2+0,  s3+0,   s4+6,   s5+6,   s6+0,   s7+0,  },
/*DISCRQ   */{ s0+0,  s1+0,  s2+0,  s3+0,   s6+7,   s6+7,   s7+8,   s7+0,  },
                                             
};

Listing Two
void ProcessFSM(int input, CAPI_MSG *msg)
{
  int newstate,oldstate;
  int action,value;
  
  value = fsm[input][state];
  newstate = GETSTATE(value);
  action = GETACTION(value);

  oldstate = state;
  state = newstate;

  switch(action){
    case 0:     //NULL action
      break;
    case 1:    //LISTEN_REQ must be issued.
      IssueListen();
      break;
      ...
   default:
     printf("FSM Error with ProcessFSM(%d) in state (%X)\n",input,oldstate);
  }
}

Listing Three
void ProcessCall(CAPI_MSG *msg)
{
  _CON_INDP *coni;
  _CON_RESP *conr;
  DWORD capi_error;
  WORD cip;
  BYTE *field, len, *bp;

  coni = &msg->info.connect_ind;
  cip = coni->CIP_Value;
  switch(cip){
     case 1:   printf("Incoming speech call\n"); break;
     case 4:   printf("Incoming 3.1kHz audio call\n"); break;
     case 16:  printf("Incoming Telephony call\n"); break;
  default:;
  }
  //now find the Calling Party Number - this may be of interest to someone
  field = &coni->structs[0];

  printf("\tNumber Called ");
  len = *field; 
  if(len){
     printf("= ");
     PutNumber(len,field);   //Called party number
     putchar('\n');
  }else
     printf("not available\n");
  field += (len+1);         // step over Called Party Number

  printf("\tCaller's Number ");
  len = *field;
  if(len){
     printf("= ");
     PutNumber(len,field);   //Calling party number
     putchar('\n');        // step over Called Party Number
  }else
     printf("not available\n");
  field += (len+1);



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