[SIPForum-discussion] Sip Proxy Server

[mwilliam prusty]

  Hi 

       Like Sip forum is there any forum to discuss the Networking issue 


Regards
William

On Thu, 24 Apr 2008 JAYESH wrote :
>Yea, there is a diff between between loop & spiral cant remember what it was but it is nicely explained in rfc 3261 draft.......
>
>Priyankam <priyankam at tataelxsi.co.in> wrote:      If only sent by is checked it can be either loop or spiral.. but for loop branch parameter will also match,
>   in case of spiral.. branch parameter will have different value.
>   hence to detect a loop we need to store the branch parameter of all request that was sent via proxy.
>   its a hectic job.. any better way to detect a loop.
>     -----Original Message-----
> From: mjhorse at qq.com [mailto:mjhorse at qq.com]
>Sent: Thursday, April 24, 2008 3:30 PM
>To: priyankam; 'prasanna c'; discussion
>Subject: Re: [SIPForum-discussion] Sip Proxy Server
>
>
>   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
>
>
>     .hmmessage P {   PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px  }  BODY.hmmessage {   FONT-SIZE: 10pt; FONT-FAMILY: Tahoma  }      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
>
>   .ExternalClass .EC_EmailQuote {   PADDING-LEFT: 4pt; MARGIN-LEFT: 1pt; BORDER-LEFT: #800000 2px solid  }      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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