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When you change the codec selection policy for the Microsoft Office Communications Server 2007 Audio Video Conferencing Server or for the Microsoft Office Communicator 2007 client through customization, renegotiation of codecs may not be successful in some conference scenarios. For example, when you try to change the codec after you resume a held conference call, you may be unable to change the codec. Conference calls are disconnected when there is a mismatch between expected codecs.
This problem is fixed in the Office Communications Server 2007 Audio Video Conferencing Server update package that was released in October, 2008.
For more information about the update package, click the following article number to view the article in the Microsoft Knowledge Base:
956831 Description of the update package for Office Communications Server 2007 Audio Video Conferencing Server: October 2008
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.