Wolfgang,

It is definitely possible that there may be multiple routed Gatekeepers involved in the call. There are several examples in the H.323 document which show where the calling and called parties each have a Gatekeeper that routes call signaling. However, it is also possible to have routed Gatekeeper or other entity routing call signaling, such as Border Elements that possess the ability to route call signaling on the edge of an administrative domain.

During call transfer, the routed gatekeeper(s) may or may not act upon the H.450 messages-- that's up to the implementer. It is certainly legal either way.

Best Regards, Paul

----- Original Message ----- From: "Wolfgang Bandow" wolfgang.bandow@DETEWE.DE To: ITU-SG16@mailbag.cps.intel.com Sent: Tuesday, July 04, 2000 5:01 AM Subject: several gatekeepers

Hello H.323-Experts,

in connection with H.323 based IP-telephony in a PISN environment we came across the question whether it is permitted to have more than two Gatekeepers involved in a point to point H.323 connection. Is this in line with H.323 conventions?

...

From my point of view this situation also occurs in case of a call

transfer, if the endpoints are located in different zones and the gatekeeper routed model is used. Is this correct?

Thanks a lot in advance for your answer.

Regards, Wolfgang Bandow CT-B / Berlin

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