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448 Dialogic
®
Global Call IP Technology Guide — November 2007
Dialogic Corporation
Variance for H.323
The gc_AnswerCall( ) function is used to send the Q.931 CONNECT message to the originating
endpoint.
Variance for SIP
The gc_AnswerCall( ) function is used to send the 200 OK message to the originating endpoint.
8.3.5 gc_CallAck( ) Variances for IP
This function is only supported in asynchronous mode.
The callack_blkp parameter must be a pointer to a GC_CALLACK_BLK structure that contains a
type field 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 whether the Proceeding message is sent manually using the
gc_CallAck( ) function or whether it is sent automatically by the stack. See Section 4.4.6,
“Configuring Proceeding Message Generation (H.323)”, on page 141 for more information.
Variance for H.323
The gc_CallAck( ) function is used to send the Proceeding message to the originating endpoint.
Variance for SIP
The gc_CallAck( ) function is used to send the 100 Trying message to the originating endpoint.
8.3.6 gc_Close( ) Variances for IP
Applications should avoid closing and re-opening devices multiple times. Board devices and
channel devices should be opened during initialization and should remain open for the duration of
the application.
8.3.7 gc_DropCall( ) Variances for IP
This function is only supported in asynchronous mode.
The cause parameter can be any of the generic cause codes documented in the gc_DropCall( )
function reference page in the Dialogic
®
Global Call API Library Reference or a protocol-specific
cause code as described below.