[Sip] INVITE after terminated dialog?
"Jane Jiang" <email@example.com> Wed, 02 January 2008 01:29 UTC
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Thread-Topic: INVITE after terminated dialog?
From: "Jane Jiang" <firstname.lastname@example.org>
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Subject: [Sip] INVITE after terminated dialog?
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Hi All, There is a weird situation with us: (1) A Linksys phone sends an INVITE out with incorrect destination TN. As a result, our application server will set up a call between the Linksys phone and an IVR (2) A user incorrectly hits the on-hold key, which is basically sending a re-INVITE to the IVR (3) Our server seems to have answered the re-INVITE with a BYE (4) The Linksys phone responds to the BYE with a 200 (5) Afterwards, the Linksys phone still thinks that its original re-INVITE has not been responded. So, it will keep resend re-INVITE The consequence of these re-INVITEs is a registration migration, which we don't like. We have been trying to figure out which side is not following RFC 3261, the phone, the SBCs are wrong, or the application servers. I am wondering: (A) Is it legal for a server to ignore the re-INVITE and respond with a BYE and has nothing in between? (B) If a UA has responded to a BYE with 200, is it supposed to forget about the re-INVITE request that it has sent out and not try to resend the re-INVITE, assuming a dialog has already been terminated with the BYE/200 transaction? Maybe in another sentence, is it legal to send our re-INVITEs outside an dialog, even if these re-INVITEs are the repeats of an original in-dialog re-INVITE? Thanks! Jane
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