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

Thu Apr 26 01:20:46 UTC 2007

Sorry dear,

i think i did not get you completely, are you trying to say that P1 cannot be in media path? (i hope not)
  ----- Original Message ----- 
  From: gurudatt balaji 
  To: Deepanshu 
  Cc: William Prusty ; discussion at sipforum.org 
  Sent: Wednesday, April 25, 2007 4:24 PM
  Subject: Re: [SIPForum-discussion] very imp question about route& recordroute

  Hi Deepanshu,

  I donot think P1 comes in the media path, also record_route header entries for subsequent requests (not media) within a dialog.

  Can u confirm.

  Reg
  Balaji

  On 4/25/07, Deepanshu <deepanshu at huawei.com> wrote: 
    yes, i think so............... P1 is a default proxy for user A to forward his request.

    request will contain the route header, now if p1 wants to be in media path then it will record route
      ----- Original Message ----- 
      From: William Prusty 
      To: Deepanshu 
      Sent: Tuesday, April 24, 2007 5:12 PM
      Subject: RE: [SIPForum-discussion] very imp question about route& recordroute

      If P1 must be configured at   A ;s client , then every time the request generated by A will contains the route header field containing the address of P1 

      Am I right?? Plz clarify

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      From: Deepanshu [mailto: deepanshu at huawei.com] 
      Sent: Tuesday, April 24, 2007 2:34 PM 
      To: William Prusty
      Cc: discussion at sipforum.org

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

      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.

----------------------------------------------------------------------

          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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