Error message when a SIP message request is sent from a federated partner in Communications Server 2007 R2: “500: Server Internal Error”

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Symptoms
When a federated partner sends a Session Initiation Protocol (SIP) message request, Microsoft Office Communications Server 2007 R2 returns the following generic SIP error message:

500: Server Internal Error
Cause
The SIP stack implementation of the federated partner does not copy the EPID parameter from the "To" header of the 200 OK message to the "To" header of the ACK message.
Resolution
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:
969821 Description of the update package for Office Communications Server 2007 R2: July, 2009
Properties

Article ID: 972709 - Last Review: 01/15/2015 19:57:35 - Revision: 2.0

Microsoft Office Communications Server 2007 R2 Enterprise Edition, Microsoft Office Communications Server 2007 R2 Standard Edition

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