Cisco Cisco Expressway
Configure the Lync B2BUA to Offer TURN Services to External Lync Clients
Prerequisites
■
The Gateway Expressway has the Microsoft Interoperability option key
■
There is a TURN server in the DMZ. This topic presumes that you will use the Expressway-E as a TURN server.
Configure TURN Services on the Gateway Expressway
To enable call connectivity with Lync clients calling via an Edge server, the B2BUA needs to have TURN services
properly configured to point to a Expressway-E with TURN enabled.
properly configured to point to a Expressway-E with TURN enabled.
1.
Go to Applications > B2BUA > B2BUA TURN servers
2.
Click New
3.
Configure the fields as follows:
TURN server address
IP address of a Expressway-E which has TURN enabled.
(Just a single Expressway; it may be just one peer from a cluster.)
(Just a single Expressway; it may be just one peer from a cluster.)
TURN server port
3478
The default TURN listening port on the Expressway-E.
On Large systems you can configure a range of TURN request listening
ports. The default range is 3478 – 3483.
ports. The default range is 3478 – 3483.
Description
An optional description of this TURN server.
TURN services username
and
and
TURN services password
The username and password that the Gateway Expressway uses to
authenticate against the TURN server. For example,
authenticate against the TURN server. For example,
GatewayB2BUA
4.
Click Add address
5.
Repeat the above steps if additional TURN servers are required
6.
Go to Applications > B2BUA > Microsoft Lync > Configuration
7.
Set Offer Turn services to Yes
8.
Click Save
Enable Screen Sharing from Lync
Prerequisites
■
Lync clients can make video calls to the Unified CM-registered endpoints
■
The Microsoft Interoperability key is installed on the Gateway Expressway
■
Enable RDP Transcoding on the Gateway Expressway
1.
Go to Applications > B2BUA > Microsoft Lync > Configuration
2.
Find Enable RDP transcoding for this B2BUA and select Yes
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Cisco Expressway with Microsoft Lync Deployment Guide