cc_CallProgress( )

Description | Cautions | Example | Errors | See Also

Name:	int cc_CallProgress(crn, indicator)
Inputs:	CRN crn	call reference number
	int indicator	progress indicator
Returns:	0 on success < 0 on failure
Includes:	cclib.h
Category:	Optional call handling
Mode:	synchronous
Technology:	BRI/2; BRI/SC; PRI (all protocols)

Description

The cc_CallProgress( ) function sends a PROGRESS message to the network. This function can be called after CCEV_OFFERED occurs, in asynchronous mode, or after the cc_WaitCall( ) function successfully completes, in synchronous mode. Applications may use the message on the D channel to indicate that the connection is not an ISDN terminal or that in-band information is available.

The cc_CallProgress( ) function is not needed in terminating mode. It may be used in a drop-and-insert configuration when an in-band Special Information Tone (SIT) or call progress tone is sent to the network.

Parameter	Description
crn:	The call reference number. Each call needs a CRN.
indicator:	Specifies the progress indicator. The values are: · CALL_NOT_END_TO_END_ISDN - In drop-and-insert configurations, the application has the option of providing this information to the network. · IN_BAND_INFO - In drop-and-insert configurations, the application has the option of notifying the network that in-band tones are available.

Cautions

None

Example

#include <windows.h>   /* For Windows applications only */  
#include <stdio.h>  
#include <errno.h>  
#include "srllib.h"  
#include "dtilib.h"  
#include "cclib.h"  
void main()  
{  
   LINEDEV   devhdl    = 0;  
   CRN       crn = 0;  
   char     *devname = "dtiB1T1";  
   if ( cc_Open( &devhdl, devname, 0 ) < 0 )   
   {  
      printf("Error opening device: errno = %d\n", errno);  
      exit(1);  
   }  
   printf("Waiting for call\n");  
   if ( cc_WaitCall(devhdl, &crn, NULL, -1, EV_SYNC) < 0 )  
       procdevfail(devhdl);  
   /*   
·	using cc_CallProgress(crn,CALL_NOT_END_TO_END_ISDN)   
·	to indicate that the remote is not an ISDN terminal.  
·	This function call is optional.  
    */   
   if ( cc_CallProgress(crn,CALL_NOT_END_TO_END_ISDN))  
       callfail(crn);  
   printf("Accepting call\n");  
   if ( cc_AcceptCall(crn, 0, EV_SYNC) < 0 )  
       callfail(crn);  
   if ( cc_AnswerCall(crn, 0, EV_SYNC) < 0 )  
       callfail(crn);  
      .  
      .  
      .  
      .  
      .  
   /* Drop the call */  
   if ( cc_DropCall(crn, NORMAL_CLEARING, EV_SYNC) < 0 )  
       callfail(crn);  
   if ( cc_ReleaseCall(crn) < 0 )  
       callfail(crn);  
   /* Close the device */  
   if ( cc_Close( devhdl ) < 0 )   
      printf("Error closing device, errno = %d\n", errno);  
}  
int callfail(CRN crn)  
{                 
        LINEDEV ld;  
        cc_CRN2LineDev(crn,&ld);  
        procdevfail(ld);  
}  
int procdevfail(LINEDEV handle)  
{  
        int reason;  
        char *msg;  
        reason = cc_CauseValue(handle);  
        cc_ResultMsg(handle,reason,&msg);  
        printf("reason = %x - %s\n",reason,msg);  
}

Errors

If the function returns < 0 to indicate failure, use the cc_CauseValue( ) function to retrieve the reason code for the failure. The cc_ResultMsg( ) function can be used to interpret the reason code. Error codes are defined in the files ccerr.h, isdnerr.h and isdncmd.h.

Error codes from the cc_CallProgress( ) function include the following:

Error Code	Description
ERR_ISDN_LIB | E_ISBADIF	Bad interface number
ERR_ISDN_LIB | E_ISBADCALLID	Bad call identifier
ERR_ISDN_LIB | E_ISBADTS	Bad time slot

See Also

None

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