Hi Marco, It is recommended that for a single reboot cycle the UA keeps same call-ID for registration requests, with increasing Cseq numbers. In practice, most of the registrars do not actually create a record in such case, so it would not make any difference. The only difference I can think of is that some servers might interpret *new Call-Id* as UA reboot scenario, but even that does not make any difference that I can think of.
regards, Rayees -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Marco Ambu Sent: Wednesday, May 09, 2007 2:15 PM To: SIP-implementors mailing list Subject: [Sip-implementors] Rules for "retry" request construction after 4xx Hi, I don't clearly understand what to do if a UAC receives a 423 response for a REGISTER request. The new register after 423 is a "retry" [3261 - 10.2.8] (after expire time is modified properly), but what rules shoud be applied to contruct the new "retry" request? 1) Call-ID, To and From must be the same and CSeq updated or [3261 - 8.1.3.5] 2) new request with different Call-ID, ..., unrelated to the preceeding request from RFC 3261 ******** 8.1.3.5 Processing 4xx Responses [401, 407, 413, 415, 416 and 420] In all of the above cases, the request is retried by creating a new request with the appropriate modifications. This new request constitutes a new transaction and SHOULD have the same value of the Call-ID, To, and From of the previous request, but the CSeq should contain a new sequence number that is one higher than the previous. With other 4xx responses, including those yet to be defined, a retry may or may not be possible depending on the method and the use case. 10.2.8 Error Responses If a UA receives a 423 (Interval Too Brief) response, it MAY retry the registration after making the expiration interval of all contact addresses in the REGISTER request equal to or greater than the expiration interval within the Min-Expires header field of the 423 (Interval Too Brief) response. ******** Thanks -- Marco Ambu R&D Software Engineering Abbeynet S.p.A. - www.abbeynet.com <http://www.abbeynet.com> phone: +39 070 2339331 <http://www.marco-ambu.sitofono.it> _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ ---------------------------------------------------------------------------------- IMPORTANT The information contained in this e-mail any attachments is intended only for the named recipient and may be privileged or confidential. If you are not the intended recipient, please notify us immediately on +44 (0)1908 425000 and do not disclose, copy, distribute or take any action based on the contents of this e-mail. You should understand and accept that, when communicating with us by e-mail, it is not a totally secure communication medium. We accept no liability for any direct, indirect or consequential loss arising from any action taken in reliance on the information contained in this e-mail and give no warranty or representation as to its accuracy or reliability. DIGITALK has the facility to monitor and read both incoming and outgoing communications by e-mail. In line with industry efforts to reduce the proliferation of Un-Solicited SPAM messages, DIGITALK uses various methods including Reverse-DNS lookups and ban-lists to prevent malicious content reaching our users. This message and any attachments has been scanned for known viruses. However, we would advise you to ensure the content is indeed virus free. We do not, to the extent permitted by law, accept any liability (whether in contract, negligence or otherwise) for any virus infection and/or external compromise of security and/or breach of confidentiality in relation to transmissions sent by e-mail. VAT No: GB 876 3287 81. Reg No: 3080801 Place of Registration: England Registered Office Address: 2 Radian Court, Knowlhill, Milton Keynes ----------------------------------------------------------------------------------" _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
