A new feature in Office Communications Server 2007 R2 is PSTN dial-in to audio conferences. (OCS 2007 had audio conferencing. It just didn’t have an attendant to which you could dial-in, provide a conference ID, and be placed in the right conference.)
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The on-premise conferencing capability in Office Communications Server allows you to invite anonymous participants. These anonymous participants shouldn’t be allowed to have a meeting all by themselves, though. At least one authenticated enterprise user
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