Cisco Cisco Expressway

Cisco

Creating a transform to strip port information from URIs

Configuring Lync Server domain static routes

Configuring static routes to route calls to the “Lync gateway” Expressway

Testing the configuration

Enabling Microsoft Edge Server and Expressway TURN capabilities

Connecting Expressway to Unified CM using TLS

Ensuring certificate trust between Unified CM and Expressway

Loading server and trust certificates on Expressway

Loading server and trust certificates on Unified CM

Configuring a SIP trunk security profile on Unified CM

Updating the Unified CM trunk to Expressway to use TLS

Updating the Expressway neighbor zone to Unified CM to use TLS

Verifying that the TLS connection is operational

Network of Expressways

Encrypted calls to endpoints registered to Unified CM

Appendix 1: Federation

Solution overview

Configuring the directory Expressway

Modifying the Lync static route configuration

Appendix 2: Troubleshooting

Troubleshooting checklist

Check for errors in the Event Log

Video endpoint reports that it does not support the Lync client SDP

TLS neighbor zone to Lync Server is active and messaging is sent from Expressway to Lync Server, but
Lync debug says Lync fails to open a connection to Expressway

Lync client initiated call fails to connect

Lync responds to INVITE with ‘488 Not acceptable here’

Call connects but clears after about 30 seconds

Media problems in calls involving external Lync clients connecting via an Edge server

One way media: Lync client to Expressway-registered endpoint

Lync rejects Expressway zone OPTIONS checks with ‘401 Unauthorized’ and INFO messages with ‘400
Missing Correct Via Header'

Lync client stays in ‘Connecting …’ state

Call to PSTN or other devices requiring caller to be authorized fails with 404 not found

Lync clients try to register with Expressway-E

B2BUA Lync Server status reports "Unknown" or "Unknown failure"

Problems with certificates

Appendix 3: Debugging on Lync

Use of Lync Server Logging Tool

Enabling debug on Lync client

Appendix 4: Interoperating capabilities and limitations

Known interoperating capabilities

Upspeeding from a voice call to a video call

Maximum call resolution

Microsoft Lync and Cisco Expressway Deployment Guide (X8.2)

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