Cisco Cisco Expressway
A Microsoft environment may use DNS instead of the Hardware Load Balancer, for example:
Note that Microsoft requires that the AD server and the FE Server are on separate machines.
Microsoft deployments may also contain Edge servers to allow Microsoft clients to register from outside the local
network through the Edge server to the Front End Server. Communicating with Microsoft 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.)
network through the Edge server to the Front End Server. Communicating with Microsoft 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 Infrastructure Deployment Guide
Appendix 3: Extended Microsoft Deployments