Hi, The Top via branch ID in Branch-ID calculation for Loop Detection MUST NOT BE included.
There is already a bug reported for this with explanation @ http://bugs.sipit.net/show_bug.cgi?id=648 HTH, Sreeram. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Poojan Tanna Sent: Thursday, October 05, 2006 6:00 PM To: Atul kumar Jha Cc: [email protected] Subject: Re: [Sip-implementors] Regarding the Record-Route suppression in the Loop/Spiral Detection Hi, As per RFC#3261, Section 16.6 SubSection 8 ( Add a Via header field value ), proxy must include top most via header field. The excerpt from RFC is as follows: " Loop detection is performed by verifying that, when a request returns to a proxy, those fields having an impact on the processing of the request have not changed. The value placed in this part of the branch parameter SHOULD reflect all of those fields (including any Route, Proxy-Require and Proxy- Authorization header fields). This is to ensure that if the request is routed back to the proxy and one of those fields changes, it is treated as a spiral and not a loop (see Section 16.3). A common way to create this value is to compute a cryptographic hash of the 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, in addition to any Proxy-Require and Proxy-Authorization header fields that may be present." Thanks, Poojan. Atul kumar Jha wrote: >Hi, > > > >I have some doubts regarding the Loop detection in case of Stateful >Proxy. > > > >Q1. Should we include the top via branch ID in the branch ID calculation >for Loop detection? > > > >Q2. And in the case of spiral should we suppress the Record Route or not >as it might lead to extra processing load for the Proxy? > > > >Thanking you in advance. > >Regards, > >Atul > > > >_______________________________________________ >Sip-implementors mailing list >[email protected] >https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
