The payload type number is negotiated per call. The payload type number field of the RTP packet header identifies the contents as 2833 NTE. The NTE payload takes the place of codec data in a standard RTP packet. They also negotiate to determine the payload type value for the NTE RTP packets. With the NTE method, the endpoints perform per-call negotiation of the DTMF transfer method. RFC 2833 defines the format of NTE RTP packets used to transport DTMF digits and other telephony events between two peer endpoints. It does not encode the audio of the tone itself, instead data represents the sent tone.
RFC 2833 specifies a way of encoding DTMF-indications in RTP media streams.
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