4.9.4. Sending Facility, UII or Registration Message Scenario
The gc_Extension( ) function can be used to send H.245 UII messages or Q.931 nonstandard facility messages. Figure 10 shows this scenario.
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.
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