Cisco Cisco Expressway
A Lync environment may use DNS instead of the Hardware Load Balancer, for example:
Note that Lync requires that the AD server and the FE Server are on separate machines.
Lync deployments may also contain Edge servers to allow Lync clients to register from outside the local network
through the Edge server to Lync. Communicating with Lync devices outside the edge server requires both the Edge
Server and the Expressway-E connecting to the public Internet. (Calls involving a Microsoft Edge server require the
Expressway to have the Microsoft Interoperability option key installed, as this key allows for ICE to be used for media
connectivity, which is required in the following scenario.)
through the Edge server to Lync. Communicating with Lync devices outside the edge server requires both the Edge
Server and the Expressway-E connecting to the public Internet. (Calls involving a Microsoft Edge server require the
Expressway to have the Microsoft Interoperability option key installed, as this key allows for ICE to be used for media
connectivity, which is required in the following scenario.)
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Cisco Expressway with Microsoft Lync Deployment Guide
Appendix 2: Extended Lync Deployments