[SIPForum-discussion] Sip Proxy Server

[mjhorse]

Hi
  
 But if all Via header is check, proxy will know for sure that if it is already on the way of the message. So, why loop cant be detected?
  
  
 ------------------
  by mj

  
  
 ------------------ Original ------------------
  From:  "Priyankam"<priyankam at tataelxsi.co.in>;
 Date:  Thu, Apr 24, 2008 05:54 PM
 To:  "'prasanna c'"<c_prasanna_c at hotmail.com>; "discussion"<discussion at sipforum.org>; 
 
 Subject:  Re: [SIPForum-discussion] Sip Proxy Server

  
  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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