Cisco Cisco TelePresence Video Communication Server Expressway
Clustered VCS systems and failover considerations
You can configure a cluster of VCS Controls and a cluster of VCS Expressways to provide failover
(redundancy) support as well as improved scalability.
(redundancy) support as well as improved scalability.
Configure DNS for Cisco Jabber.
Note that when discovering Unified CM and IM&P servers on VCS Control, you must do this on the master
peer.
peer.
Media encryption
Media encryption is enforced on the call legs between the VCS Control and the VCS Expressway, and
between the VCS Expressway and endpoints located outside the enterprise. Call legs between VCS Control
and endpoints within the enterprise will not be encrypted.
between the VCS Expressway and endpoints located outside the enterprise. Call legs between VCS Control
and endpoints within the enterprise will not be encrypted.
The encryption is physically applied to the media as it passes through the B2BUA on the VCS Control.
Advanced VCS Control configuration
This section covers the advanced Unified Communications settings that can be configured on VCS Control.
Credential caching intervals
The VCS caches endpoint credentials which have been authenticated by Unified CM. The caching of
credentials reduces the frequency with which the VCS has to submit endpoint credentials to Unified CM for
authentication, and thus improves system performance.
credentials reduces the frequency with which the VCS has to submit endpoint credentials to Unified CM for
authentication, and thus improves system performance.
To configure the caching settings, go to
Configuration > Unified Communications
and then click Show
advanced settings.
The Credentials refresh interval specifies the number of minutes for which endpoint credentials are cached
in the VCS database. The default is 480 minutes.
in the VCS database. The default is 480 minutes.
The Credentials cleanup interval specifies the frequency with which the VCS database runs a cleanup
process to remove expired credentials. In large deployments, a regular cleanup process helps to maintain the
system's performance. The default is 720 minutes.
process to remove expired credentials. In large deployments, a regular cleanup process helps to maintain the
system's performance. The default is 720 minutes.
Unified Communications: Mobile and Remote Access via Cisco VCS Deployment Guide (X8.1.1)
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Additional information