Article ID: 968505 - View products that this article applies to.
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When you use Microsoft Office Communicator version 2.0.6362.97 or later, you cannot transfer a call. For example, this issue occurs in the following scenario:
This issue occurs when the user's Session Initiation Protocol (SIP) Uniform Resource Identifier (URI) contains an upper case character.
To resolve this issue, install the update for Communicator 2007 that is dated March 2009. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/961552/ )Description of the update for Communicator 2007: March 2009
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.