The SIP NTE DTMF relay feature provides reliable digit relay between Cisco VoIP gateways when a low bandwidth codec is used. Using NTE to relay DTMF tones provides a standardized means of transporting DTMF tones in Real-Time Transport Protocol (RTP) packets according to section 3 of RFC 2833, RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals, developed by the Internet Engineering Task Force (IETF) Audio/Video Transport (AVT) working group. This paper describes the Dual Tone Multifrequency (DTMF) Relay for SIP Calls Using Named Telephone Events (NTE) feature in Cisco IOS Release 12.2(11)T.
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