SIP protocol - Independent of transport layer
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Posted by karthikbalaguru on December 9, 2009, 12:17 pm
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Hi, I find that,SIP is designed to be independent of the underlying transport layer; it can run on Transmission Control Protocol (TCP), User Datagram Protocol (UDP), or Stream Control Transmission Protocol (SCTP). Then, why is the SIP protocol referred as a " TCP/IP-based Application Layer protocol " ? Any ideas ? Reference - http://en.wikipedia.org/wiki/Session_Initiation_Protocol Thx in advans, Karthik Balaguru | ||||||||||||||||||||||
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Posted by David Schwartz on December 9, 2009, 1:12 pm
Please log in for more thread options wrote:  information from point A to point B and what information the protocol gets from point A to point B. While SIP is designed to be independent of the underlying transport layer and could theoretically get information from point A to point B by some non-TCP/IP mechanism, what is the actual information it's getting from point A to point B? Look at typical SIP messages and you'll see they convey information *about* TCP/IP protocols, addresses, and ports. DS | ||||||||||||||||||||||
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Posted by karthikbalaguru on December 9, 2009, 9:35 pm
Please log in for more thread options Thx for the response. I have another query related with SIP while using Audio or Video stream. The voice and video stream communications in SIP applications are carried over another application protocol, the Real-time Transport Protocol (RTP). Parameters (port numbers, protocols, codecs) for these media streams are defined and negotiated using the Session Description Protocol (SDP) which is transported in the SIP packet body. And these parameters are used to determine the type of media(Audio/Video) and put in the corresponding queue/buffer in the user terminal rather than parsing the entire packet to determine the presence or absence of audio / video. Is the above understanding correct ? Correct me if i am wrong. Thx in advans, Karthik Balaguru | ||||||||||||||||||||||
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Posted by Thomas T. Veldhouse on December 27, 2009, 1:54 am
Please log in for more thread options You aren't asking these questions because you are looking for answers; you already know what the answers are. What is the *real* reason that you are asking these questions? -- Thomas T. Veldhouse Religion is a crutch, but that's okay... humanity is a cripple. | ||||||||||||||||||||||
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Posted by karthikbalaguru on December 27, 2009, 4:39 am
Please log in for more thread options I wanted to confirm my understanding so that the design can be visualized. Thx, Karthik Balaguru | ||||||||||||||||||||||
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> I find that,SIP is designed to be independent of the underlying
> transport layer; it can run on Transmission Control Protocol (TCP),
> User Datagram Protocol (UDP), or Stream Control Transmission
> Protocol (SCTP).
> Then, why is the SIP protocol referred as a =A0" TCP/IP-based
> Application Layer protocol " ? Any ideas ?
> Reference -http://en.wikipedia.org/wiki/Session_Initiation_Protocol