RE: [Sip-implementors] Sending BYE before ACK (not discussed yet!!!)

[Franz Edler]

Hello,   I am at the moment working through RFC 3261, and therefore I am interested in taking part in discussing your question. I hope you don’t mind that. My view is the following:   According to RFC 3261 16.7  (Response Processing of a Proxy) step 10 requires the proxy to immediately generate CANCEL requests for all pending client transactions. These CANCEL requests will terminate the transactions to C and D. So it is very unlikely, that other 200 OK will be forwarded to the A. But if this is the case (more than one 200 OK received by A in case of a race condition at the proxy), than the proxy will also to CANCEL the pending client transaction. If A sends ACK and BYE it might generate a 481 Transaction Does not Exist.   This is my view. Please tell me, if I am wrong.   Franz   From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ramachandran Iyer Sent: Dienstag, 23. September 2003 10:55 To: Oleksandr Sakada; [EMAIL PROTECTED] Subject: Re: [Sip-implementors] Sending BYE before ACK (not discussed yet!!!)   Once you have accepted the the transaction from B (200 OK), you will have to cancel the other forked request. As you say, what if one gets 200 from others as well (C, D in your case). To comply with the spec, the other side would expect ACK for a final response (200 ok). So you will have to send ACK (as it is late to send a CANCEL at this point..) . After having done that, you can immediately send out BYE's to the other legs (C, D) to take down those connections.   Rama Oleksandr Sakada <[EMAIL PROTECTED]> wrote: Hi! I saw a lot of discussions regarding sending of BYE request in the archive of this discussion list, but my question is different. Assume the following scenario: INVITE A -------------> B, C, D (forking) 200 OK A <------------- B, C, D At this point A has to acknowledge the first received 200 OK (let it be from B) responce and terminate others dialogs: ACK A --------------> B Here is the question. Should A send ACK requests also to the C and D and after that immediately send a BYE request to C and D, or just send BYE request to C and D after received second and third 200 OK response? In the first case if ACK will not be delivered to the C and D, the situation will look like the second scenario... Thank you in advance. _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software

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