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

Tue Apr 24 09:04:27 UTC 2007

P1 MUST be configured in A's client
  ----- Original Message ----- 
  From: William Prusty 
  To: Deepanshu ; Srinivas . 
  Cc: discussion at sipforum.org 
  Sent: Tuesday, April 24, 2007 11:52 AM
  Subject: RE: [SIPForum-discussion] very imp question about route& recordroute

  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.????

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  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 . 

    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.

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    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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