[SIPForum-discussion] Sip Proxy Server

[Priyankam]

You are trying to say if the sent-by matches loop is detected? what about
branch parameter? shouldn that also match with Via..
One more doubt if only sent by check is done.. then it can also be spiral
detection.. in this we cant discard the request?

Please solve these issues.
  -----Original Message-----
  From: prasanna c [mailto:c_prasanna_c at hotmail.com]
  Sent: Thursday, April 24, 2008 2:05 PM
  To: priyankam at tataelxsi.co.in; discussion at sipforum.org
  Subject: RE: [SIPForum-discussion] Sip Proxy Server


  You should check all the via headers that has sent-by value placed by
proxy in earlier forwarding to detect the loop.



----------------------------------------------------------------------------
    From: priyankam at tataelxsi.co.in
    To: discussion at sipforum.org
    Date: Thu, 24 Apr 2008 12:39:15 +0530
    Subject: [SIPForum-discussion] Sip Proxy Server


    Hi,

      we have a confusion regarding loop detection by proxy server. As per
the RFC 3261 we create key for branch parameter using , To tag, From tag,
Call-ID header
    field, the Request-URI of the request received (before translation), the
topmost Via header, and the sequence number from the CSeq header field.

    But the confusion is if the request traverses through several proxies
and the same request comes back to the previous proxy, the top most via gets
changed,
    so the Key generated will be different, hence loop detection is not
possible.

    Please suggest a solution for this issue.

    Regards,
    Priyankam
    Tata Elxsi Ltd.
    Bangalore



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