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Microsoft Office Communicator 2007 uses strict Request for Comments (RFC) 3966 validation rules for all incoming telephone numbers. Therefore, Communicator 2007 does not support non-Direct Inward Dial (DID) telephone numbers.
To make Communicator 2007 support non-DID telephone numbers, install the Communicator 2007 update that is dated October 24, 2008 on the client computers.
For more information about this update, click the following article number to view the article in the Microsoft Knowledge Base:
957707 Description of the update for Communicator 2007: October 24, 2008
Additionally, you must install update packages for Communications Server 2007 Mediation Server and for Microsoft Office Communications Server 2007.
For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
952780 Description of the update package for Communications Server 2007 Mediation Server: August 2008
952783 Description of the update package for Communications Server 2007: August 2008
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about RFC 3966, visit the following Web site:
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952785 Outgoing calls from Communications Server 2007 Mediation Server may not be routed correctly