Enhanced Locations Call Admission Control Overview
Enhanced locations call admission control (CAC) provides control over WAN bandwidth in complex WAN topologies as well as distributed deployments, where multiple clusters manage devices in the same physical sites using the same uplinks. Enhanced locations CAC also allows you to control call admissions for immersive video calls, such as TelePresence separately from other video calls.
To define how your system handles media, you structure your network model around the concepts of locations and links.
A location represents a local area network (LAN). It could contain endpoints or simply serve as a transit location between links for wide area network (WAN) network modeling.
Links interconnect locations and are used to define bandwidth available between locations. Links represent the WAN link.
Weights are measurements of bandwidth pathways. These are used on links to provide a cost to the effective path. Weights are provided when there is more than one path between any two locations.
Your system calculates shortest paths (least cost) from all locations to all locations and builds effective paths. These have the least overall weight and are the most efficient pathways.
Your system tracks bandwidth across any link that the network model indicates from originating location to terminating location.
Location Bandwidth Manager
The location bandwidth manager (LBM) service computes the effective path from source location to destination location. It provides useful functions behind the scenes, such as handling bandwidth requests from Unified Communications Manager call control and replicating bandwidth information within the cluster and between clusters. You can find the configured and realtime information this function provides in Serviceability Administration.
Locations Media Resource Audio Bit Rate Policy service parameter determines the bit rate value to deduct from the audio bandwidth pools within and between the locations of the parties for an audio-only call when a Media Resource such as a transcoder is inserted into the media path and for more complex scenarios. This service parameter does not have any impact if there is no media in one of the call legs. In such cases, location bandwidth manager deducts the maximum hop bandwidth configured for the source destination from the available bandwidth of that location.
Do not change the Location Bandwidth Manager bandwidth or link configurations during production hours as that could unnecessarily spike CPU utilization on the server.
Intercluster Enhanced Locations Call Admission Control
The intercluster function extends enhanced locations CAC network modeling across multiple clusters. Each cluster manages its own network topology. They then propogate their topologies to other clusters that are configured In the LBM intercluster replication network.
A shared location is a location that is configured with the same name on clusters participating in a the LBM replication network.
This type of location serves the following purposes:
Enables clusters to share their respective configured topologies with one another
Lets multiple clusters perform CAC on the same locations