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"SIP/2.0 504 Cannot connect to gateway" error message when a PSTN call is routed to a Mediation server in Lync Server 2010
Article ID: 2539642 - View products that this article applies to.
Consider the following scenario:
SIP/2.0 504 Cannot connect to gateway. Socket error: TimedOut
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.