3.4.3. gc_CallAck( )

When using H.323, the gc_CallAck( ) function is used to send the Proceeding message to the originating endpoint.

When using SIP, the gc_CallAck( ) function is used to send the 100 Trying message to the originating endpoint.

The callack_blkp parameter must be a pointer to a GC_CALLACK_BLK structure that contains a type parameter with a value of GCACK_SERVICE_PROC. The following code example shows how to set up a GC_CALLACK_BLK structure and issue the gc_CallAck( ) function.

    GC_CALLACK_BLK gcCallAckBlk; 
    memset(&gcCallAckBlk, 0, sizeof(GC_CALLACK_BLK));  
    gcCallAckBlk.type = GCACK_SERVICE_PROC;
    rc = gc_CallAck(crn, &gcCallAckBlk, EV_ASYNC); 

The application can configure if the Proceeding message is sent manually using the gc_CallAck( ) function or if it is sent automatically by the stack. See Section 4.15, Configuring the Sending of the Proceeding Message for more information.

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