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The Microsoft Office Communications Server (OCS) 2007 R2 - A/V Edge Authentication Server does not recognize a token request if the locale for RTCProxyService is not en-US/409. Therefore, OCS clients cannot contact the A/V Edge Server, and some connectivity scenarios are broken.
The A/V Edge Authentication Server was not using the correct language invariant form of some string manipulation functions. This caused a problem when a locale used something other than a period character (.) as a decimal separator.
To work around this problem, change the locale setting to English for the local account that the A/V Edge Server and the A/V Edge Authentication Server use.
To resolve this problem, apply the following update:
967831 Description of the update package for Communications Server 2007 R2: April 2009
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.