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The Communications Server 2007 Mediation Server rejects an incoming invite on its proxy Communications Server 2007 side which has a Required header with the Replaces option
Article ID: 952782 - View products that this article applies to.
The Microsoft Office Communications Server 2007 Mediation Server rejects an incoming Invite on its proxy when the proxy has a Required header together with the Replaces option. Currently, this causes no known problems in an Office Communications Server 2007 deployment because no known Office Communications Server 2007 components send such an Invite. However, applications that are based on Unified Communications (UC) programming interfaces that are provided by Microsoft for Office Communications Server 2007 R2 will send such an Invite to the Mediation Server.
To resolve this issue, install the August 2008 update package for Office Communications Server 2007 Mediation Server. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
952780This update package prevents future problems in mixed environments in which an Office Communications Server 2007 Mediation Server must interact with the next release of Office Communications Server 2007 components such as Astana.
(http://support.microsoft.com/kb/952780/ )Description of the update package for Office Communications Server 2007 Mediation Server: August 2008
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.