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In Microsoft Office Communications Server 2007 R2, a user tries to dial into a conference through the conferencing attendant as the conference leader or as an authenticated. In this case, the user must use a telephone extension or a full telephone number. However, the dial-in conferencing page does not provide this information to the user if one of the following conditions is true:
The user does not have an assigned telephone number.
The user has a telephone extension that is not unique in the enterprise.
Therefore, the user cannot dial into the conference as the conference leader or as an authenticated user.
To resolve this issue, apply the following update:
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
969824 Description of the update package for Office Communications Server 2007 R2, Communicator Web Access: July 2009
Note After users apply this update, the dial-in conferencing page provides more feedback to describe an error situation. This update also helps users determine whether the user should use a telephone extension or a full telephone number to dial in as the conference leader or as an authenticated user.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.