Cisco Cisco Expressway Maintenance Manual
Field
Description
Usage tips
Port on B2BUA
for Lync
presence
communications
for Lync
presence
communications
The port used on the B2BUA for presence
communications with the Microsoft Lync server.
communications with the Microsoft Lync server.
Default is 10011.
Configuring the B2BUA's Trusted Hosts
The B2BUA trusted hosts page (Applications > B2BUA > Microsoft Lync > B2BUA trusted hosts) is used to specify
the devices that may send signaling messages to the Lync B2BUA.
the devices that may send signaling messages to the Lync B2BUA.
The B2BUA only accepts messages from devices whose IP address is included in the list of trusted hosts.
Note that trusted host verification only applies to calls initiated by Lync that are inbound to the Expressway video
network. It is not necessary to configure trusted hosts if calls are only ever to be initiated from the Expressway video
network.
network. It is not necessary to configure trusted hosts if calls are only ever to be initiated from the Expressway video
network.
The Expressway has a limit of 25 trusted hosts. If there are more than 25 trusted hosts, the Expressway raises an
alarm. You can work around this limit by adding another Gateway Expressway, or by pointing some of the Lync
servers to a Lync proxy and then trusting the proxy instead.
alarm. You can work around this limit by adding another Gateway Expressway, or by pointing some of the Lync
servers to a Lync proxy and then trusting the proxy instead.
The configurable options are:
Field
Description
Usage tips
Name
An optional free-form description of the trusted
host device.
host device.
The name is not used as part of the
"trusted" criteria. It is provided only to help
distinguish between multiple devices, rather
than having to rely on their IP addresses.
"trusted" criteria. It is provided only to help
distinguish between multiple devices, rather
than having to rely on their IP addresses.
IP address
The IP address of the trusted host device.
Type
The type of device that may send signaling
messages to the B2BUA.
messages to the B2BUA.
Lync device: this includes Hardware Load
Balancers, Directors and Front End Processors
Balancers, Directors and Front End Processors
Transcoder: a transcoder device such as a Cisco
TelePresence Advanced Media Gateway
TelePresence Advanced Media Gateway
Configuring External Transcoder Policy Rules
The Microsoft Lync B2BUA transcoder policy rules page (Applications > B2BUA > Microsoft Lync > Transcoder
policy rules) is used to define the rules that control which Lync B2BUA calls are routed via a
policy rules) is used to define the rules that control which Lync B2BUA calls are routed via a
If Enable transcoders for this B2BUA (configured on the Microsoft Lync B2BUA configuration page) is Yes, then all
calls are routed via the transcoders by default. If transcoder resources need to be reserved for specific types of calls
then you can specify rules to limit the types of calls that are routed via the transcoders.
calls are routed via the transcoders by default. If transcoder resources need to be reserved for specific types of calls
then you can specify rules to limit the types of calls that are routed via the transcoders.
■
The rules on this page are only applied if Use transcoder policy rules (also configured on the Microsoft Lync
B2BUA configuration page) is set to Yes.
B2BUA configuration page) is set to Yes.
■
A rule is applied if it matches either the source or destination alias of a call.
■
If the aliases associated with a call do not match any of the policy rules, the call will be routed via the
transcoder. Therefore you may want to consider having a general low priority rule with a regex pattern match
for all aliases that denies transcoder resources, and then have more specific rules with a higher priority that
define the participants that are allowed to use the transcoder resources.
transcoder. Therefore you may want to consider having a general low priority rule with a regex pattern match
for all aliases that denies transcoder resources, and then have more specific rules with a higher priority that
define the participants that are allowed to use the transcoder resources.
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Cisco Expressway Administrator Guide