RFC 2833 to DTMF Audio Tones

When the SDP offer side supports RFC 2833, and the SDP answer side supports the three DTMF Audio Tone conditions and does not support RFC 2833, the Oracle® Enterprise Session Border Controller converts from RFC 2833 to DTMF audio tones for the call.

A SIP INFO message received by the Oracle® Enterprise Session Border Controller from either the offerer or answerer is converted into the DTMF transfer method that the previous diagram shows for the egress side of the message. In this case, transcoding resources are used.