Industry Standard Protocols White Papers
Dual Tone Multifrequency Relay for SIP Calls Using Named Telephone Events
Overview 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.
| Publisher | Cisco Systems | File Format | PDF, requires Acrobat Rdr 5 |
|---|---|---|---|
| Date Published | September 2003 | Downloads | 49 |
| Format | White Papers | ||
| Topics | |||
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