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

Tue Apr 24 03:52:36 UTC 2007

Thank u deepansu. 

If p1 is not configured in A "s client , then whether at that time A
required help of DNS to find the address of p1.????

________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Deepanshu
Sent: Tuesday, April 24, 2007 7:23 AM
To: Srinivas .
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] very imp question about route&
recordroute

My understanding about this is:

P1 is the proxy server in A's domain, so the address of P1 should be
configured in the A's client.

when P1 receive the request it will do the DNS query to find the
location of the next hop in the target domain (as per the line mentioned
by Srinivas) and then send the request to P2 which will inturn forward
the request to B

Deepanshu Gautam
R&D Engineer
Huawei Technologies Co. Ltd.
Nanjing Institute, No 91 BaiXia Rd. 
Nanjing, Jiangsu, P. R. China 210001
Mobile: +86-13585147627
Email: depanshu at huawei.com

	----- Original Message ----- 

	From: Srinivas . <mailto:nsrinivas at techmahindra.com>  

	To: William Prusty <mailto:williamp at techmahindra.com>  ;
mwilliam prusty <mailto:callwilliam90653 at rediffmail.com>  ;
discussion at sipforum.org 

	Sent: Monday, April 23, 2007 6:44 PM

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

	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

diago sigline
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