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Microsoft® Lync® Server 2013 Unleashed Second Edition by Randy Wintle, Alex Lewis, David Ross, Tom Pacyk

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Blocking Media over VPN

In fact, organizations deploying Lync Edge services should be going out of their way to avoid the possibility of clients connecting a media stream over the VPN tunnel. Lync clients always prefer a direct peer-to-peer connection when negotiating a call, but they don’t have any logic to determine whether they are on a VPN connection. So when a user establishes a VPN and then tries to call a user on the internal network, the two clients will think they should connect peer-to-peer instead of relaying their traffic through the Edge Server.

Depending on the VPN technology, organizations can use a combination of defined port ranges, IP address ranges, and source executable names to effectively block Lync clients from connecting ...

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