Karthik,
I'm having trouble understanding the motivation for your questions. Some
of them are basic stuff, that can be answered by a reading of RFC3261.
Are you new to sip, trying to get the fundamentals here?
Some of your other questions seem to be asking about *why* sip is the
way it is. If you are really interested in the history of the evolution
of sip, then you should start by mastering it as it is first. Then some
of us can discuss how it got there, if you really care. In some cases
things are now just accidents of history. But in general they are now so
well established that there is little point in discussing alternatives.
(You can safely assume there will be no sip v2.1 or v3.0. If there were
to be a successor it probably wouldn't look enough like sip to be called
that. In some sense you can think of webrtc as the next version of sip.)
Thanks,
Paul
On 1/7/16 10:27 AM, Karthik.v wrote:
Hi all,
Some queries regarding,
*) How many contacts can be present in 3XX reponse ..?
*) Other than INVITE method whether in any other method contact header field
is mandatory ?
*) If the first element in the route set is a loose router then client
should take the first element as a request URI .. ?
*) Why contact header is mandatory in INVITE request ..? through via itself
UAS can send response & request
Thanks in advance.
Thanks,
Karthik V
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