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UNDERSTANDING SIP TRACES - Cisco Community
https://community.cisco.com/t5/collaboration-voice-and-video/understanding-sip-traces/ta-p/3137704
Description of Media parameter in SIP "m=audio 12548 …
https://stackoverflow.com/questions/27869523/description-of-media-parameter-in-sip-m-audio-12548-rtp-avp-0-8-101
(m=audio). 12548 is a port address for streaming media. "RTP/AVP" means "RTP Audio/Video Profile" and representing one of RTP profiles, which are coded by 0, 8 and 101. 0 is PCMU 8000 Hz, 8 is PCMA 8000 Hz, and 101 is payload type for DTMF digits sending.
Understanding Media In SIP Session Description Protocol ...
https://teraquant.com/understand-media-sip-session-description-protocol/
Codec specific parameters can be included through the fmtp attribute. m=audio 49230 RTP/AVP 18 96 97 98 a= rtpmap:18 G729/8000/1 a=rtpmap:96 L8/8000 a=rtpmap:97 L16/8000 a=rtpmap:98 L16/11025/2 a=fmtp:18 annexb=yes. During the early stages of RTP development, statically assigned payload types (0-34) were used to bind encodings to payload …
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.
SIP Trunking For Dummies: Which Codec Should You Use ...
https://teledynamic.com/2013/05/sip-trunking-for-dummies-which-codec-should-you-use/
Common VoIP Codec Protocols. G.729 G.729 is a codec that has low bandwidth requirements but provides good audio quality. This is the most commonly used codec in VoIP calling and has a MOS rating of 4.0. G.711 G.711 is a codec that was introduced by ITU in 1972 for use in digital telephony. With only a 1:2 compression and a 64K bitrate for each direction (128K …
The Session Description Protocol (SDP) - 3CX
https://www.3cx.com/blog/voip-howto/sdp-voip2/
Media name and Transport address - m=audio 61896 RTP 0 8 3 101. audio = Media type of stream. This can also be video, message, audio etc. 61896 = The port number on which the media stream will be transmitted. RTP = The protocol which will be used to stream the media, in this case Real Time Protocol.
VoIP Protocols: SIP - Session Description Protocol
http://toncar.cz/Tutorials/VoIP/VoIP_Protocols_SIP_Session_Description_Protocol.html
Within SIP, the Session Description Protocol is used to exchange data the endpoints need to send and receive RTP streams with audio and possibly video. Thus, the most important parameters exchanged using SDP are the IP addresses, port numbers, and codecs.
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
sip - Using SDP media type application with RTP/AVP (m=application <Port #> RTP/AVP <Payload>) - Stack Overflow. I am trying to get familiar with the anatomy of a SIP SDP. Here is a sample SDP from my Tandberg VC unit. v=0o=tandberg 1 3 IN IP4 192.168.1.94s=-c=IN IP4 192.168.1.94b=AS:768t=0 0m=audio 47... Stack Overflow.
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