Re: [Sip] BYE race and re-INVITE doubt

["Matthias Konrad" <mkonrad@hsr.ch>]

Hi,
I think that a stateful proxy doesn't care about any of the cases
you described. A proxy, as far as I know, shouldn't hold any dialog states.
He just knows about INVITE and nonINVITE transaction states. If that is
true, he doesnt even know, that the two BYE Requests belongs to the same
dialog.


----- Original Message -----
From: "Sp.Raja" <spraja@isofttechindia.com>
To: <sip@ietf.org>
Sent: Thursday, July 18, 2002 6:27 AM
Subject: [Sip] BYE race and re-INVITE doubt


> Hi,
>
> Please clear my doubts on the following
>
> 1. What is expected out of the SIP element when it receives BYE after
> sending a BYE?
> Ex. Let UA1 and UA2 be two user agents and P1, P2 be proxies
>
>        UA1    P1      P2      UA2
>        |\      |       |      /|
>        | \     |       |     / |
>        |  \    |       |    /  |
>        |   \   |       |   /   |
>        |BYE \  |       |  / BYE|
>        |     \>|\     /|</     |
>        |       | \   / |       |
>        |       |  \ /  |       |
>        |       |   \   |       |
>        |       |  / \  |       |
>        |       *</   \>*       |
>        |       |       |       |
>        |       |       |       |
>
> What will P1 and P2 do now after receiving BYE? They have already received
> BYE from the opposite side and yet to receive the response for it.
>
>
> 2. When can re-INVITE be send?
> I assume it can be send only after receiving ACK or sending ACK
accordingly.
> What is expected out of the proxy in the following cases? Does it simply
> drops the re-INVITE?
>
> UAC sending re-INVITE after sending INVITE and yet to receive final
response
> UAC sending re-INVITE instead of ACK after sending INVITE, received final
> response
> UAS sending re-INVITE after receiving INVITE
> UAS sending re-INVITE after sending final response to INVITE and before
> receiving ACK
>
>
>
>
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> Use sip-implementors@cs.columbia.edu for questions on current sip
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>




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Use sipping@ietf.org for new developments on the application of sip