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Global Call IP Technology Guide — November 2007 449
Dialogic Corporation
Variance for H.323
Allowable protocol-specific cause codes are prefixed by IPEC_H225 or IPEC_Q931 in Chapter 11,
“IP-Specific Event Cause Codes”.
Variance for SIP
Cause codes and reasons are only supported when gc_DropCall( ) is issued while the call is in the
Offered state. Allowable protocol-specific cause codes are prefixed by IPEC_SIP in Chapter 11,
“IP-Specific Event Cause Codes”.
Note: A Global Call application may not always receive a GCEV_DISCONNECTED event when
terminating a call, because BYE messages are not retried if lost due to network errors.
8.3.8 gc_Extension( ) Variances for IP
This function is only supported in asynchronous mode.
The gc_Extension( ) function can be used for the following purposes:
• retrieving call-related information
• getting notification of underlying protocol connection or disconnection state transitions
• getting notification of media streaming initiation and termination in both the transmit and
receive directions [not supported in 3PCC operating mode]
• specifying which DTMF types, when detected, provide notification to the application [not
supported in 3PCC operating mode]
• sending DTMF digits [not supported in 3PCC operating mode]
• retrieving protocol messages (Q.931, H.245, and registration)
• sending protocol messages (Q.931, H.245, and registration)
• performing T.38 fax server operations
Table 26 shows the valid extension IDs and their purpose.