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When you transfer a call in Microsoft Office Communicator 2007, the call fails. This problem occurs if the telephone number to which the call is transferred does not have the E164 normalization rule applied to it.
Mediation Server does not perform the uniform resource identifier (URI) validation for the call that is transferred.
To resolve this problem, download and install the hotfix that is described in the following Microsoft Knowledge Base article:
943086 Description of the update package for Communications Server 2007 Mediation Server 2007: December 17, 2007