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4.11. Specifying RTP Stream Establishment
When using Global Call, RTP streaming can be established before the call is connected (that is, before the calling party receives the GCEV_CONNECTED event). This feature enables a voice message to be played to the calling party (for example, a message stating that the called party is unavailable for some reason) without the calling party being billed for the call.
The gc_SetUserInfo( ) function can be used to specify call-related information such as coder information and display information before issuing gc_CallAck( ), gc_AcceptCall( ) or gc_AnswerCall( ). See Section 3.4.18, gc_SetUserInfo( ) for more information.
On the called party side, RTP streaming can be established before any of the following functions are issued to process the call:
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