Re: [Sip] Should early dialogs be dropped when 2xx is received???

["Sanjay Sinha (sanjsinh)" <sanjsinh at cisco.com>]

>
>   The UAC core considers the INVITE transaction completed 
>64*T1 seconds
>   after the reception of the first 2xx response.  At this 
>point all the
>   early dialogs that have not transitioned to established dialogs are
>   terminated.  Once the INVITE transaction is considered completed by
>   the UAC core, no more new 2xx responses are expected to arrive.
>
>Thus the other early dialogs will linger for 64*T1 seconds.

Right, this is true if the UAC wants to have multiple final dialogs.

If it does not, then I do not think the UAC has to wait for 64*T1
seconds. It can terminate early dialogs by sending a BYE with
appropriate to-tag corresponding to the early dialog leg, that it wants
to terminate.

Sanjay

>
>If the UAC does destroy all the other early dialogs, then it 
>would need to be able to handle any additional 2xx responses 
>for unknown dialogs, presumably by sending an ACK immediately 
>followed by a BYE. This is really the same case as an 
>additional 2xx response arriving for a brand new dialog (i.e. 
>the UAC never received a 1xx).
>
>cheers,
>(-:bob
>
>-----Original Message-----
>From: sip-bounces at ietf.org [mailto:sip-bounces at ietf.org] On 
>Behalf Of Paul Kyzivat
>Sent: Tuesday, August 05, 2008 10:16 AM
>To: Christer Holmberg
>Cc: SIP IETF
>Subject: [Sip] Should early dialogs be dropped when 2xx is received???
>
>The following in the discussion of 199 issues reminded me of a 
>question I have had for a long time. I'm changing the subject 
>because it isn't directly pertinent to the 199 discussion.
>
>Christer Holmberg wrote:
>
>> What I mean to say is that when the UAC receives a final 
>response for 
>> an early dialog it normally releases all other early dialogs 
>(the UAC 
>> should of course still be ready to accept 200 OK responses for other 
>> dialogs).
>
>This has always been a fuzzy area to me. If the UAC is 
>prepared to retain multiple final dialogs if they happen, is 
>it still expected to release early dialog state for other 
>dialogs when it receives the first 2xx? That could mean that 
>subsequent 2xx responses can't be turned into viable dialogs 
>because state has been lost. (E.g. if preconditions were being 
>negotiated during the early dialog.)
>
>Shouldn't the rule be that *if* the UAC is only intending to 
>retain the first final dialog then it should/may abandon all 
>other early dialogs when it receives a 2xx, but if it might 
>want to keep additional dialogs if additional 2xx responses 
>are received, then it ought not drop the early dialogs?
>
>        Thanks,
>        Paul
>
>_______________________________________________
>Sip mailing list  https://www.ietf.org/mailman/listinfo/sip
>This list is for NEW development of the core SIP Protocol Use 
>sip-implementors at cs.columbia.edu for questions on current sip 
>Use sipping at ietf.org for new developments on the application 
>of sip _______________________________________________
>Sip mailing list  https://www.ietf.org/mailman/listinfo/sip
>This list is for NEW development of the core SIP Protocol Use 
>sip-implementors at cs.columbia.edu for questions on current sip 
>Use sipping at ietf.org for new developments on the application of sip
>
_______________________________________________
Sip mailing list  https://www.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use sip-implementors at cs.columbia.edu for questions on current sip
Use sipping at ietf.org for new developments on the application of sip