Call routing in Expressway deployments relies on the use of dial plans and zones, and it is assumed that these concepts are understood. For more information on configuring dial plans and zones, see the Expressway documentation.
Dial plans are used by the call control system to favor sending calls to local Meeting Server resources, thereby reducing inter-office bandwidth.
On the call control device:
Configure a zone for each Call Bridge in the Call Bridge Group. Go to Configuration > Zones and create a New zone of type Neighbor, that this cluster will directly communicate with. You need one zone per Call Bridge node.
Figure 1 Creating new zones on Expressway
In the Advanced section, select the Zone profile as Custom and set the load balancing parameter to On.
Figure 2 Setting the Meeting Server load balancing parameter
For each zone, create a search rule pointing to the zone. Go to Configuration > Dial plan > Search rules and create a New search rule. Each search rule must have a different priority, and On successful match must be set to Continue.
When choosing priorities it is important to consider the order in which you want this to use resources. Local resources would typically have higher priority than remote resources.
Figure 3 Creating a search rule for connections to local resources
If remote resources are going to be used via other clusters, configure search rules that resolve to these. These rules would typically have a lower priority than rules to local s, and typically have a source set to avoid call loops.
Figure 4 Creating search rules for connections to other Expressway clusters
For more information on using load balancing across Cisco Meeting Servers, see the latest versions of Cisco Meeting Server 2.x, Load Balancing Calls Across Cisco Meeting Servers and Cisco Meeting Server 2.x, Scalability and Resilience Deployment Guide.