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break;
:
}
:
}
4.26.10 Terminating a Call After a T.38 Fax Session
After a T.38 fax session is finished, and prior to issuing gc_DropCall( ), the T.38 Fax device needs
to be disassociated from the Media device using the gc_SetUserInfo( ) function. The following
code provides and example.
INT32 processEvtHandler()
{
METAEVENT metaEvent;
GC_PARM_BLK *parmblkp = NULL;
IP_CONNECT ipConnect;
:
switch (evtType)
{
case GCEV_DISCONNECTED:
/* received extension event, parse PARM_BLK examine extension data */
/* disconnect the media and fax devices */
ipConnect.version = 0x100;
ipConnect.mediaHandle = pline->mediaH;
gc_util_insert_parm_ref(&parmblkp, 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(parmblkp);
/* dropcall */
gc_DropCall(pline->crn, GC_NORMAL_CLEARING, EV_ASYNC);
break;
}
:
}
4.27 Sending and Receiving V.17 Faxes
The Dialogic® HMP system is capable of originating and receiving a fax using a V.17 soft modem.
This facility can be used with the Dialogic
®
Global Call API library routing the V.17 PCM data
over a G.711 coder in a “fax pass-through” mode by connecting the fax (dxxx) device directly to
the media (ipm) device via a PCM connection.
Alternatively, the V.17 PCM data can be routed over a PSTN connection by connecting the fax
(dxxx) device directly to the DTI front end device (refer to the Dialogic
®
Fax Software Reference).
4.27.1 Sending G.711 Fax in an Established Audio Session
In the scenario shown in Figure 61, the user application uses the Dialogic
®
Global Call API to open
a Media device and make a voice call. A Fax device is then opened and the application connects the
Fax device to the voice session.