[SIPForum-discussion] very imp question about route & recordroute

Mon Apr 23 10:44:11 UTC 2007

William Refer RFC 3261 Section.10.

If a user wants to initiate a

session with another user, SIP must discover the current host(s) at

which the destination user is reachable. This discovery process is

frequently accomplished by SIP network elements such as proxy servers

and redirect servers which are responsible for receiving a request,

determining where to send it based on knowledge of the location of

the user, and then sending it there.

________________________________

From: William Prusty 
Sent: Monday, April 23, 2007 1:36 PM
To: Srinivas .; mwilliam prusty; discussion at sipforum.org
Subject: RE: [SIPForum-discussion] very imp question about route &
recordroute

Thank a lot srinivas. Plz make me clarify one thing more 

                If A doesn't know IP address of p1 then how the invite
request will reached at B

________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Srinivas .
Sent: Monday, April 23, 2007 11:05 AM
To: mwilliam prusty; discussion at sipforum.org
Subject: Re: [SIPForum-discussion] very imp question about route &
recordroute

William my comments inline

________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of mwilliam prusty
Sent: Saturday, April 21, 2007 10:20 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] very imp question about route & record
route

can any body tell that 

suppose the call setup is lke  A  p1    p2    B

here A is user agent client. B is user agent  server. p1 & p2 are proxy.

1.let A has generated an  INVITE request to B . in which case the invite
request generated by A will conatin ROUTE header field.????
[Srinivas]  Generally , proxy P1 gets IP address of B from location
server also if there are any proxies in between. 

               Proxy P1 (generate INVITE) fills route and send  INVITE. 

User A can fill route set only if it knows the proxies between user A
and user B.

2. let p1 has rcved the INVITE request containg ROUTE heder field.
is it mandatory that the invite from point p1 to p2 will conatin RECORD
ROUTE heder field.????? if yes why if not why???

[Srinivas] In some cases, it may be useful for proxies in the SIP
signaling path to see all the messages pass between the endpoints for
the session. In that case it will add RECORD ROUTE.  If it don't want to
be in the path, it will not add the RECORD ROUTE.

plz anser

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