[SIPForum-discussion] UAC - INVITE Transaction Timeout Timer
Mark R Lindsey
lindsey at e-c-group.com
Thu Jun 18 18:42:33 UTC 2009
RFC3261 13.3.1.1 talks about this somewhat.
I believe this is the timer you seek: "A proxy has the option of
canceling a transaction when there is a gap of 3 minutes between
responses in a transaction. To prevent cancellation, the UAS MUST send
a non-100 provisional response at every minute, to handle the
possibility of lost provisional responses."
On Jun 18, 2009, at 10:20 AM, sreekant nair wrote:
>
> Hi Everyone,
>
> Have a query regarding Timers.
>
> If a client sends an INVITE and receives a provisional response but
> does NOT get a Final Response, is there a Timer that clears up the
> transaction?
>
> RFC3261 specifies Timer B as the INVITE Transaction Timeout Timer.
> However in the state transition diagram, there is no mention of
> whether Timer B is stopped,restarted on moving from the "CALLING"
> state to the "PROCEEDING" state on receiving a 1xx message. These
> are my specific queries:
> • If while in "PROCEEDING" state no final response is received,
> what happens?
> • Is it implied that Timer B is only stopped/canceled on receiving
> a final response?
> • What happens when Timer B fires? Should the client send a CANCEL
> or just kill the transaction?
> Thanks for any inputs in this regard.
>
> Regards
> Sreekant Nair
>
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