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The Session Description Protocol (SDP)
https://www.3cx.com/blog/voip-howto/sdp-voip2/
The Session Description Protocol (SDP)-VoIP Part 2. 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 ...
[MS-SDP]: Audio and Video | Microsoft Docs
https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-sdp/22a734fa-160c-49da-a782-807b24269557
The Session Description Protocol (SDP) for an audio/video session is standard (according to RFC) with one exception: negotiation of encryption of the audio/video session uses additional extensions, which are specified in section 3.1.5.5.
[MS-SDP]: Audio/Video Encryption | Microsoft Docs
https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-sdp/c48d8b88-ac53-4a1b-929b-8c6cbbb3b191
In this article. For audio/video sessions, the initiating and receiving parties MUST negotiate support for encryption by using a new SDP attribute.. To implement the new SDP encryption attribute, <5> two pieces of information are required for audio/video encryption. The first is to determine whether encryption is required, and the second is to determine what the …
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.
What is SDP •• Session Description Protocol | 3CX
https://www.3cx.com/pbx/sdp/
SDP does not in itself deliver any media, but simply limits itself to the negotiation of a compatible set of media exchange parameters; the media streams themselves are handled by a different channel and protocol. Looking at this simple example: v=0 o=MyStreamer 2398026505 2307593197 IN IP4 10.20.30.40 s=MyStreamer Audio Session c=IN IP4 10.11 ...
RFC 8866: SDP: Session Description Protocol
https://www.rfc-editor.org/rfc/rfc8866.pdf
An SDP description includes the following media information: The type of media (video, audio, etc.) The media transport protocol (RTP/UDP/IP, H.320, etc.) The format of the media (H.261 video, MPEG video, etc.) In addition to media format and transport protocol, SDP conveys address and port details. For an IP multicast session, these comprise:
SIP - Session Description Protocol - Tutorialspoint
https://www.tutorialspoint.com/session_initiation_protocol/session_initiation_protocol_sdp.htm
SDP is generally contained in the body part of Session Initiation Protocol popularly called SIP. SDP is defined in RFC 2327. An SDP message is composed of a series of lines, called fields, whose names are abbreviated by a single lower-case letter, and are in a required order to simplify parsing. Purpose of SDP
RFC 4566 - SDP: Session Description Protocol
https://tools.ietf.org/html/rfc4566
RFC 4566 SDP July 2006 1.Introduction When initiating multimedia teleconferences, voice-over-IP calls, streaming video, or other sessions, there is a requirement to convey media details, transport addresses, and other session description metadata to the participants. SDP provides a standard representation for such information, irrespective of how that information is transported.
Understanding Media In SIP Session Description Protocol ...
https://teraquant.com/understand-media-sip-session-description-protocol/
So that we can troubleshoot such codec negotiations, let’s first take a quick peek at the Session Description Protocol. RFC 4566 (obsoletes RFC 2327) defines the details of SDP in complete detail intended for describing multimedia sessions for purposes of session announcement, session invitation and other forms of multimedia session initiation such as …
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