Cisco Cisco Expressway Maintenance Manual
n
The Lync B2BUA does not consume any call licenses in addition to the license required by the leg of the
call between the endpoint and the Expressway.
call between the endpoint and the Expressway.
n
If all configured transcoders reach their capacity limits, any calls that would normally route via a transcoder
will not fail; the call will still connect as usual but will not be transcoded.
will not fail; the call will still connect as usual but will not be transcoded.
n
The Lync B2BUA supports multiple TURN servers. TURN servers are recommended for calls traversing a
Microsoft Lync Edge server.
Microsoft Lync Edge server.
n
Bandwidth controls can be applied to the leg of the call between the endpoint and the B2BUA, but cannot
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 Expressway to B2BUA leg in
effect also controls the B2BUA to Lync leg implicitly.
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 Expressway to B2BUA leg in
effect also controls the B2BUA to Lync leg implicitly.
n
The non-configurable neighbor zone (named "To Microsoft Lync server via B2BUA") that connects the
Expressway 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.
Expressway 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 Expressway and Microsoft Lync see:
n
n
Configuring the Microsoft Lync B2BUA
The
Microsoft Lync B2BUA configuration
page (
Applications > B2BUA > Microsoft Lync >
Configuration
) is used to enable and configure the B2BUA's connection to Microsoft Lync devices.
The configurable options are:
Field
Description
Usage tips
Configuration
section:
Microsoft Lync
B2BUA
B2BUA
Enables or disables the Microsoft Lync B2BUA.
Lync signaling
destination
address
destination
address
The IP address or Fully Qualified Domain Name
(FQDN) of the Hardware Load Balancer, Director
or Front End Processor to which the Expressway
sends the signaling messages.
(FQDN) of the Hardware Load Balancer, Director
or Front End Processor to which the Expressway
sends the signaling messages.
. These are the Lync
devices that may send signaling messages
to the Expressway.
to the Expressway.
Lync signaling
destination port
destination port
The IP port on the Hardware Load Balancer,
Director or Front End Processor to which the
Expressway sends the signaling messages.
Default port is 5061.
Director or Front End Processor to which the
Expressway sends the signaling messages.
Default port is 5061.
Lync signaling
transport
transport
The transport type used for connection to the
Microsoft Lync server. The default is TLS.
Microsoft Lync server. The default is TLS.
Transcoders
section:
Enable
transcoders for
this B2BUA
transcoders for
this B2BUA
Controls whether calls may be routed through a
transcoder.
transcoder.
You should enable this option if you need
to use a transcoder such as the Cisco
TelePresence Advanced Media Gateway
to transcode between standard codecs
(such as H.264) and Microsoft RT Video
and RT Audio.
to use a transcoder such as the Cisco
TelePresence Advanced Media Gateway
to transcode between standard codecs
(such as H.264) and Microsoft RT Video
and RT Audio.
Cisco Expressway Administrator Guide (X8.2)
Page 181 of 378
Applications
B2BUA (back-to-back user agent) overview