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When you use telephony mode=4, you can only manually set the Uniform Resource Identifier (URI) information in Microsoft Office Communicator 2007. This problem affects large enterprises that have to have this information set for each user.
To resolve this problem, install the update for Communicator 2007 that is dated October 24, 2008. For more information, 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
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.