Dialogic IP Phone 05-2239-009 User Manual

An H.245 UII message can only be sent when a call is in the connected state. A Q.931 nonstandard 
facility message can be sent in any call state. 

The Dialogic

®

 Global Call API IP call control library supports the tunneled signaling message 

capability that is documented in Annex M of the ITU-T recommendations for H.323. This 
capability allows DSS/QSIG/ISUP messages to be encapsulated in common H.225 call signaling 
messages. Note that this tunneled message capability is separate and distinct from H.245 
tunnelling. 

The tunneled signaling message capabilities are described in the following topics:

The ITU-T H.323  Annex M recommendation specifies that tunneled signaling message fields may 
be contained in any of nine different H.225 messages: Setup, Call Proceeding, Alerting, Connect, 
Release Complete, Facility, Progress, Information, and Notify. The Global Call implementation of 
tunneled signaling messages allows applications to send and receive tunneled messages in the first 
six of the listed H.225 messages. The Dialogic

®

 Global Call API library does not support 

application access to the last three messages in the list of messages specified in Annex M 
(Progress, Information, and Notify) so these message types cannot be used for tunneled signaling 
messages. 

gc_Extension( )

(ip_ext = IPEXTID_SENDMSG)

GCEV_EXTENSIONCMPLT

GCEV_EXTENSION

(ip_ext = IPEXTID_RECEIVEMSG)