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Dialogic Corporation
break;
:
}
:
}
4.26.9 Receiving a Request to Switch from T.38 Fax to Audio
An application may receive a request to switch from a T.38 Fax session back to an audio session.
The request is received as a GCEV_EXTENSION event that is triggered by a RequestMode
(H.323) or re-INVITE (SIP) message. Before accepting the incoming request, the application must
disassociate the T.38 Fax device from the Media device using the gc_SetUserInfo( ) function, then
continue accepting the request as described in Section 4.26.5, “Accepting/Rejecting a Request to
Switch Between Audio and T.38 Fax”, on page 325.
INT32 processEvtHandler()
{
METAEVENT metaEvent;
GC_PARM_BLK *parmblkp = NULL;
GC_PARM_DATAP t_gcParmDatap = NULL;
GC_PARM_BLK *parmblkp2 = NULL;
EXTENSIONEVTBLK *ext_evtblkp = NULL;
IP_CONNECT ipConnect;
:
switch (evtType)
{
case GCEV_EXTENSION:
/* received extension event, parse PARM_BLK examine
* extension data
*/
ext_evtblkp = (EXTENSIONEVTBLK *) metaEvent.extevtdatap;
parmblkp = &ext_evtblkp->parmblk;
while (t_gcParmDatap = gc_util_next_parm(parmblkp, t_gcParmDatap))
{
switch(t_gcParmDatap->set_ID)
{
case IPSET_SWITCH_CODEC:
switch(t_gcParmDatap->parm_ID)
{
case IPPARM_AUDIO_REQUESTED:
/* disconnect the media and fax devices */
ipConnect.version = 0x100;
ipConnect.mediaHandle = pline->mediaH;
gc_util_insert_parm_ref(&parmblkp2, IPSET_FOIP, IPPARM_T38_DISCONNECT,
sizeof(IP_CONNECT), (void *)(&ipConnect));
gc_SetUserInfo(GCTGT_GCLIB_CRN, pline->crn, parmblkp, GC_SINGLECALL);
gc_util_delete_parm_blk(parmblkp2);
/* accept audio request by example 4.3.3 */
acceptCodecSwitchRequest();
break;
case IPPARM_READY:
/* Ready to send and receive audio */
gc_Listen();
break;
}
break;
:
}
}