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Understanding Session Description Protocol (SDP) | Tao ...
https://andrewjprokop.wordpress.com/2013/09/30/understanding-session-description-protocol-sdp/#:~:text=The%20audio%20codecs%20will%20use%20port%2049170%20and,the%20other%20SDP%20values%20that%20might%20be%20present.
The Session Description Protocol (SDP)
https://www.3cx.com/blog/voip-howto/sdp-voip2/
When a SIP based VoIP call is established, the audio or video sent between two SIP entities or more is streamed. Since many different codecs are supported by different devices or software, and each individual SIP entity taking part in the call does not know the IP address of the other SIP entity or to which port the stream should be sent to, SDP is used to advertise such …
Understanding Session Description Protocol (SDP) | Tao ...
https://andrewjprokop.wordpress.com/2013/09/30/understanding-session-description-protocol-sdp/
It can support three audio codecs and one video codec. The audio codecs are G.711 uLaw (PCMU), G.711 aLaw (PCMA), and iLBC. The audio codecs will use port 49170 and all have a sample rate of 8000 Hz. The video codec is H.261 on port 51327. 99.9% of the time I can safely ignore any of the other SDP values that might be present.
Brief Introduction of SIP and SDP Protocol – Yeastar …
https://support.yeastar.com/hc/en-us/articles/360009806434-Brief-Introduction-of-SIP-and-SDP-Protocol-
SDP parameters. IP PBX and IP Phone use SIP to establish calls and use SDP to negotiate the parameters of media stream (audio, video). Here are some related parameters in SDP Media description. m=media name, port, proto and payload; media name: audio, video. port: the port to receive media stream. proto: RTP/AVP, RTP/SAVP. RTP/AVP represents RTP
RFC 4566 - SDP: Session Description Protocol
https://tools.ietf.org/html/rfc4566
In addition to media format and transport protocol, SDP conveys address and port details. For an IP multicast session, these comprise: o The multicast group address for media o The transport port for media This address and port are the destination address and destination port of the multicast stream, whether being sent, received, or both.
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