4.13.2. Initiating Fax Transcoding

Calls initiated or answered using the Global Call API support fax transcoding transparently without intervention by the application. For fax transcoding to occur, the line device or call must have specified and exchanged the T.38 UDP coder as one of the supported channel capabilities.

If this coder has been specified, fax transcoding will be initiated upon detection of a CED, CNG or V.21 tone from the local endpoint. Upon detection of one of these fax tones, the current audio RTP stream will be terminated and fax transmission will be initiated. If the remote endpoint does not support T.38 UDP fax capability, no T.38 transcoding change occurs.

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