Cisco Cisco Expressway
Summary of configuration objectives
This document describes how to configure Lync and the Expressway in B2BUA mode to enable calls from:
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Microsoft Lync clients registered on Lync Server to other Lync clients registered on that Lync Server.
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SIP video endpoints registered to Unified CM in the video network to Lync clients registered on Lync.
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Lync clients registered on Lync Server to video endpoints registered in the video network.
Lync environments
Lync environments have a number of building blocks, and so they may be constructed in many ways. A full
scale Lync deployment is likely to use Lync Director, Hardware Load Balancers (HLBs), Front End
Processors (FEPs) in enterprise pools, and a redundant AD server.
scale Lync deployment is likely to use Lync Director, Hardware Load Balancers (HLBs), Front End
Processors (FEPs) in enterprise pools, and a redundant AD server.
For Lync installations, Microsoft recommend that DNS may be used in place of hardware load balancing for
routing SIP traffic. Microsoft guidance can be found at
routing SIP traffic. Microsoft guidance can be found at
An example architecture is shown below:
Microsoft Lync and Cisco Expressway Deployment Guide (X8.5)
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Introduction