Cisco TelePresence Administrator's Manual page 245

Applications
If a call is routed through the Lync B2BUA, the B2BUA always takes the media and always remains in the
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signaling path. The call component that is routed through the B2BUA can be identified in the call history
details as having a component type of Microsoft Lync B2BUA.
The Lync B2BUA does not consume any call licenses in addition to the license required by the leg of the
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call between the endpoint and the VCS.
If all configured transcoders reach their capacity limits, any calls that would normally route via a transcoder
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will not fail; the call will still connect as usual but will not be transcoded.
The Lync B2BUA supports multiple TURN servers. TURN servers are recommended for calls traversing a
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Microsoft Lync Edge server.
Bandwidth controls can be applied to the leg of the call between the endpoint and the B2BUA, but cannot
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be applied to the B2BUA to Microsoft Lync leg of the call. However, as the B2BUA forwards the media it
receives without any manipulation, any bandwidth controls applied to the VCS to B2BUA leg in effect also
controls the B2BUA to Lync leg implicitly.
The non-configurable neighbor zone (named "To Microsoft Lync server via B2BUA") that connects the
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VCS to the Lync B2BUA uses a special zone profile of Microsoft Lync — this profile is only used by the
Lync B2BUA and cannot be selected against any manually configured zones.
For more information about configuring VCS and Microsoft Lync see:
Microsoft Lync B2BUA port reference [p.397]
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Microsoft Lync and VCS Deployment Guide
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Microsoft Lync 2010, Cisco AM GW and VCS Deployment Guide
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Configuring the Microsoft Lync B2BUA
The Microsoft Lync B2BUA configuration
Configuration) is used to enable and configure the B2BUA's connection to Microsoft Lync devices.
The configurable options are:
Field Description
Configuration section:
Microsoft Lync Enables or disables the Microsoft Lync B2BUA.
B2BUA
Lync signaling The IP address or Fully Qualified Domain Name
destination (FQDN) of the Hardware Load Balancer, Director
address or Front End Processor to which the VCS sends
the signaling messages.
Lync signaling The IP port on the Hardware Load Balancer,
destination port Director or Front End Processor to which the
VCS sends the signaling messages. Default port
is 5061.
Lync signaling The transport type used for connection to the
transport Microsoft Lync server. The default is TLS.
Capabilities section:
Cisco VCS Administrator Guide (X8.1.1)
page (Applications > B2BUA > Microsoft Lync >
Usage tips
You must also configure the IP addresses
of the
devices that may send signaling messages
to the VCS.
B2BUA (back-to-back user agent) overview
trusted hosts. These are the Lync
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