I'm having a problem with Exchange Conferencing Server.
Regardless of how many people join a conference, all the
participants see is a Local and a Remote video window.

It seems as if there is something stopping the multi-cast
traffic from reaching the clients, hence the conference is
falling back to h.323.

Previously, the conference server was on our core network
and (I am told) all participants could see all other
participants simultaneously.

Since moving the server to our DMZ this problem has
surfaced.

There is a Cisco PIX between the DMZ & Core. To try and
eliminate the PIX from the problem, there is no packet
filtering between the DMZ & the core.

Questions:

Should all perticipans be able to see each other at the
same time?

Does anyone have any suggestions on what might be the
problem (if there is one)?

Thanks for your help,

Peter

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