Hans,

H.323 does not require that the call be cleared, so strictly speaking it is an implementation decision. However, I would think that the best thing to do would be to continue the call as an unregistered EP. There are a couple of situations to consider, however.

1. The URQ could unregister specific aliases registered to the EP, in which case it is still a "registered EP" and must therefore abide by the requirements imposed on a registered EP, e.g., sending DRQ at the end of the call.

2. The URQ could unregister the EP itself (indicated by not specifying aliases), in which case the EP simply becomes an unregistered alias. This has no normative effect on a call, although I an implementation could clear the call and still be compliant.

Here are the relevant passages:

7.2.2/H.323v4: "A Gatekeeper may cancel the registration of an endpoint by sending an Unregister Request (URQ) message to the endpoint. The endpoint shall respond with an Unregister Confirmation (UCF) message. The endpoint shall attempt to re-register with a Gatekeeper prior to initiating any calls."

ibid: "If the Gatekeeper sends a URQ message containing a list of alias addresses, the endpoint shall assume that only those alias addresses are unregistered. A URQ that contains no aliases shall indicate a request to unregister the endpoint."

ibid: "An endpoint which is not registered with a Gatekeeper is called an unregistered endpoint. This type of endpoint does not request admission permission from a Gatekeeper and so cannot participate in admissions control, bandwidth control, address translation and other functions performed by the Gatekeeper."

Paul Long ipDialog, Inc.

-----Original Message----- From: Mailing list for parties associated with ITU-T Study Group 16 [mailto:ITU-SG16@mailbag.cps.INTEL.COM]On Behalf Of Hans Viens Sent: Thursday, September 13, 2001 1:16 PM To: ITU-SG16@mailbag.cps.INTEL.COM Subject: URQ while a call is in progress

Hi Folks,

I was just wondering: if the gatekeeper sends a URQ to an endpoint that has a call in progress, what should happen to this call ? Should it be cleared ? It is possible to give me an indication where I could find this information on the standard ?

Thanks,

Hans

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