[SIPForum-discussion] Sip Proxy Server

[Raj]

"spirals": revisit same server, with different request URI
"loop": revisit same server, with same request URI

On Thu, Apr 24, 2008 at 8:27 PM, JAYESH <thesweethuman at yahoo.co.in> 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
>
>  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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-- 
-Raaz
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