Quick Asked: Rtpmap 101 Telephone Event?
Last update: 02 May, 2024 
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What is the rtp payload format for named telephone events? The RTP payload format for named telephone events is designated as "telephone-event", the media type as "audio/telephone-event". In accordance with current practice, this payload format does not have a static payload type number, but uses an RTP payload type number established dynamically and out-of-band.What does artpmap mean in rfc 3264? Please note that The RFC 3264 [17] specifies that the attributes containing “a=rtpmap” should be used for each media field This line defines the media attribtes that will be used for the call. Audio: means that this is an Audio call, we can also have m=video in case of a Video callWhat is the maximum number range for dtmf events in sip? Note that as a DTMF standard, all SIP entities should at least support DTMF events from 0 to 15, which are 0-9 (numbers), 10 = *, 11 = # and 12 -15 are A-D. Samples per packet / packetization time.What is 101101 dtmf payload type number? 101 = DTMF payload type number the SIP phone supports. For each Codec being advertised in the above SDP capture, details about Media Attributes Fieldname, Media format and Media type is given separately. Note that the codec’s are listed depending on priority set by the user from the phone set’s configuration options.
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DTMF and RFC 2833 / 4733 Tao, Zen, and Tomorrow
Specifically, it uses something called telephone-event. Here is an example of an SDP media description that you might see in the body of an Invite message. Note the format of “0 – 16.” This represents the ten digits plus *, #, A, B, D, E, and Flash. m=audio 12346 RTP/AVP 101. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-16
Sip SDP Offer/Answer model with DTMF rtpmap/fmtp
m = audio 1235 RTP/AVP 8 120 a = rtpmap:8 PCMA/8000 a = rtpmap:120 telephone-event/8000 a = fmtp:101 0-15 a = sendrecv From RFC 3264: For streams marked as sendrecv in the answer, the "m=" line MUST contain at least one codec the answerer is willing to both send and receive, from amongst those listed in the offer.
Strange DTMF issue
a = rtpmap: 101 telephone-event / 8000 a = fmtp: 101 0-16. This part of SDP body comes from PBX side but Mediant does not reply to LYNC. Seems it acts not in a trasparent way. If call goes viceversa, from Lync to mediant then PBX, Mediant adds the SDP part above, as coming from Lync side. I really suppose this is a bug at Mediant side.