Dialogic Global Call IP Benutzerhandbuch

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Dialogic Corporation

Allowable protocol-specific cause codes are prefixed by IPEC_H225 or IPEC_Q931 in 

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 

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. 

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.