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170 Dialogic
®
Global Call IP Technology Guide — November 2007
Dialogic Corporation
IP-Specific Operations
4.8.2 Supported Q.931 Message IEs
Table 5 shows the supported Q.931 message Information Elements (IEs), the parameter set ID and
parameter ID that should be included in a GC_PARM_BLK when setting or retrieving the IEs, and
the maximum allowed length of the IE value.
4.8.3 Setting Q.931 Message IEs
The Dialogic
®
Global Call API library supports the setting of the following Information Elements
(IEs) in the following outgoing Q.931 messages:
• Bearer Capability IE in a SETUP message
• Facility IE in SETUP, CONNECT, and FACILITY messages
The gc_SetUserInfo( ) function is used to set these IEs. The appropriate function parameters in
this context are:
• target_type – GCTGT_GCLIB_CHAN
• target_id – line device
• infoparmblkp – a GC_PARM_BLK containing the IPSET_CALLINFO parameter set ID and
one of the following parameter IDs:
– IPPARM_BEARERCAP
– IPPARM_FACILITY
• duration – GC_SINGLECALL (GC_ALLCALLS is not supported in this context)
4.8.4 Retrieving Q.931 Message IEs
The Dialogic
®
Global Call API library supports the retrieval of the following Information Elements
(IEs) from the following incoming Q.931 messages:
• Bearer Capability IE in a SETUP message
• Facility IE in SETUP, CONNECT, and FACILITY messages
Table 6 shows the Dialogic
®
Global Call API events generated for incoming Q.931 messages and
the parameter set ID and parameter IDs contained in the GC_PARM_BLK associated with each
event.
Table 5. Supported Q.931 Message Information Elements
IE Name Set/Get Set ID Parameter ID Maximum Length
Bearer Capability Get and Set IPSET_CALLINFO IPPARM_BEARERCAP 255
Facility Get and Set IPSET_CALLINFO IPPARM_FACILITY 255
Note: These parameters are character arrays with the maximum size of the array equal to the maximum
length shown.