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

[Deepanshu]

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 . 
  To: William Prusty ; mwilliam prusty ; 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

   


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  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

   


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  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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