It is most definitely not a requirement to have the GK route a call which is expanded in an ad-hoc fashion. The MC location must be known from the point at which the first two participants complete their connection, but the MC may reside with one of the two endpoints.

If the MC is 'hidden' behind the GK and it is routing the call, the GK simply signals as it _is_ the MC.

jimt.

At 10:24 PM 3/6/98 +0800, you wrote:

Dear All,

Is it a must for the Gatekeeper to route the Call Signalling Channel
and H.245 Control Channel in order to support ad hoc Multipoint
Conference?

If it is a must, what shall the Gatekeeper and MC do? Is it correct
that Gatekeeper shall pass (redirect)the transport address of the two
endpoints to MC and let MC to start the Capability exchange procedure
(TerminalCapabilitySet) with them? So that the previous H.245 channel
between the two endpoint can becomes two H.245 between the two
endpoint and the MC?


     GateKeeper
        / \                    One H.245 Control Channel between
       /   \                   Endpoint1 and Endpoint2
      /     \                  routed by Gatekeeper
Endpoint1   Endpoint2

        MC
        / \                    Two H.245 Control Channels between
       /   \                   the two endpoint and MC
      /     \
Endpoint1   Endpoint2



Thank you for answering my question!

Best Regards,
Vincent Chen
E-mail: VincentSHChen@acer.com.tw

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