Article ID: 2517687 - View products that this article applies to.
Consider the following scenario:
This issue occurs because the INVITE request arrives from the same signaling IP address. Therefore Mediation Server cannot determine reliably whether the call comes from the PSTN gateway, or the virtual PSTN gateway.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2502810/ )Description of the cumulative update for Lync Server 2010, Mediation Server: April 2011
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about how Media Bypase works, visit the following Microsoft Technet website:
How Media Bypass Works
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