Dialogic 05-2239-009 User Manual

255

Dialogic Corporation

To retrieve TSM after receiving a Global Call state change event corresponding to an Alerting, 
Connected, Proceeding, ReleaseComplete, or Setup message, the application first constructs a 
GC_PARM_BLK that specifies the type of information it wishes to retrieve, then calls the 
gc_Extension( ) function to request the information. 

The GC_PARM_BLK must contain the following two parameter elements:

IPSET_TUNNELEDSIGNALMSG

IPPARM_TUNNELEDSIGNALMSG_CONTENT

value is unused; set to 1

IPSET_TUNNELEDSIGNALMSG

IPPARM_TSM_CONTENT_EVENT

value = appropriate TSM_CONTENT_... tag value as listed in Table 17

When the application calls gc_Extension( ), the parameters should be set up as follows:

target_type must be GCTGT_GCLIB_CRN

target_id must be a valid CRN

ext_id must be IPEXTID_GETINFO

parmblkp must point to the GC_PARM_BLK that was configured to contain the required 
parameter element as just described. 

retblkp must be a valid pointer to a GC_PARM_BLK 

mode must be EV_ASYNC

If the received H.225 message contained a tunneled signaling message, the library generates an 
asynchronous GCEV_EXTENSIONCMPLT completion event. The extevtdatap field in the 
METAEVENT structure for this event is a pointer to an EXTENSIONEVTBLK structure, which in 
turn contains a GC_PARM_BLK that contains the fields of the received tunneled signaling 

Setup

GCEV_OFFERED

TSM_CONTENT_OFFERED

Proceeding

GCEV_PROCEEDING †

TSM_CONTENT_PROCEEDING

Alerting

GCEV_ALERTING

TSM_CONTENT_ALERTING

Connected

GCEV_CONNECTED

TSM_CONTENT_CONNECTED

Release Complete

GCEV_DISCONNECTED

TSM_CONTENT_DISCONNECTED

Facility

GCEV_EXTENSION

TSM_CONTENT_EXTENSION

† The GCEV_PROCEEDING event is maskable. When Tunneled Signalling Messages are enabled, the 
application must ensure that this event is not masked.