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UNDERSTANDING SIP TRACES - Cisco Community
https://community.cisco.com/t5/collaboration-voice-and-video/understanding-sip-traces/ta-p/3137704
m=audio 25268 RTP/AVP 18 0 8 101 . 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 call. 25268: Is the dynamic RTP port used for the call. RTP/AVP: Represents the RTP/AVP profile number for each of the profiles listed.
Additional Information
https://docs.oracle.com/en/industries/communications/enterprise-session-border-controller/9.0.0/configuration/additional-information.html
m=audio 0 RTP/AVP 0 c=IN IP4 192.0.2.4 m=audio 0 RTP/AVP 0 a=rtpmap:0 PCMU/8000 The first does not include the RTP map entry, but uses the standard payload type of 0. If the Oracle® Enterprise Session Border Controller receives an SDP like the first, it uses the payload type 0 to locate the corresponding media profiles configuration.
[MS-SDP]: Audio/Video Encryption | Microsoft Docs
https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-sdp/c48d8b88-ac53-4a1b-929b-8c6cbbb3b191
If encryption is not allowed, SDP signaling MUST carry a media-level attribute as shown in the following. m=audio 49170 RTP/AVP 0 a=encryption:rejected. The encryption key to use MUST be carried in a media-level key parameter, as shown in the following example.
Knowledgebase Article: SmartMedia: SDP profile ...
https://www.patton.com/support/kb_art.asp?art=408
m=audio 0 RTP/AVP 0 8 4 18 98 13 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:4 G723/8000 a=fmtp:4 bitrate=6300;annexa=yes a=rtpmap:18 G729/8000 a=fmtp:18 annexb=yes a=rtpmap:98 telephone-event/8000 a=fmtp:98 0-15 a=rtpmap:13 CN/8000. Another example to disable silence suppression explicitly in the SDP.
sip - Using SDP media type application with RTP/AVP (m ...
https://stackoverflow.com/questions/48015713/using-sdp-media-type-application-with-rtp-avp-m-application-port-rtp-avp-p
I am trying to get familiar with the anatomy of a SIP SDP. Here is a sample SDP from my Tandberg VC unit. v=0 o=tandberg 1 3 IN IP4 192.168.1.94 s=- …
Solved: SIP/SDP - no codec specifed - Cisco Community
https://community.cisco.com/t5/ip-telephony-and-phones/sip-sdp-no-codec-specifed/td-p/3913990
The numbers at the end of this m line: m=audio 23610 RTP/AVP 8 0 18 97 Those are the codecs. They are RTP payload types, and in preference order. Eg 8=g711alaw, 0=g711ulaw, 18=g729, 97=this one is special, it's actually what they want to Mark RTP-NTP (RFC2833) DTMF relay as.
Wireshark Q&A
https://osqa-ask.wireshark.org/questions/42297/can-see-sipsdp-m-audio-rtpavp-but-no-rtp-packets-or-sessions/
Wireshark Q&A. 0. In my captured file (pcap) I can see SIP/SDP packets. But No RTP. I tried decoding UDP as RTP, but still wireshark cannot see RTP sessions. Here is one of the SIP/SDP packet data. What can be the reason ?
RFC 4317 - Session Description Protocol (SDP) Offer/Answer ...
https://datatracker.ietf.org/doc/html/rfc4317
RFC 4317 SDP Offer/Answer Examples December 2005 v=0 o=bob 2808844564 2808844564 IN IP4 host.biloxi.example.com s= c=IN IP4 host.biloxi.example.com t=0 0 m=audio 49174 RTP/AVP 97 a=rtpmap:97 iLBC/8000 m=video 49170 RTP/AVP 31 a=rtpmap:31 H261/90000 [Second-Offer] v=0 o=bob 2808844564 2808844565 IN IP4 host.biloxi.example.com s= c=IN IP4 …
RTP payload formats - Wikipedia
https://en.wikipedia.org/wiki/RTP_payload_formats
Audio and video payload types. RFC 3551, entitled RTP Profile for Audio and Video (RTP/AVP), specifies the technical parameters of payload formats for audio and video streams.. The standard also describes the process of registering new payload types with IANA; additional payload formats and payload types are defined in the following specifications:
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