Routing Principles in SIP Cluster

[New Page] Given below is a sample deployment diagram to illustrate the routing principles in SIP Cluster:

In the above sample, there are two Data Centers with two SIP Cluster nodes each. All 4 SIP Cluster nodes talk to the same SIP Cluster switch, which is used to configure all DNs except the VQ DNs. The VQ DNs are configured using a separate switch.

SIP Cluster Nodes and SIP Cluster Switch

• Each SIP Cluster node has a dedicated routing solution consisting of URS, ORS, and Stat Server.
• All SIP Cluster nodes share the same switch where all routing point DNs and agent DNs are configured.
• The same strategy is loaded to all nodes. This allows for distribution of inbound calls across all SIP Cluster nodes and processing them using the same strategy.

ORS Deployment

• A dedicated 2-node ORS Cluster is deployed to serve each SIP Cluster node.
  • By default ORS instances are running on the primary and backup SIP Cluster VMs.
• A dedicated Cassandra ring is deployed for each ORS Cluster.
  • cassandra-keyspace-name: Orchestration
  • cassandra-nodes: FQDN_SIP_Cluster_Primary_VM; FQDN_SIP_Cluster_Backup_VM

Important

To create a high performance solution, the number of ORS pairs per SIP cluster node can be increased.

VQ Switch Deployment and Connectivity

VQ switches offer a distributed agent reservation solution for a blended environment (voice and multi-media). A VQ switch is a centralized place for VQ DN configuration and they help simplify provisioning. VQ switches also result in a performance improvement by helping unload VQ traffic from the SIP cluster.

In the above sample diagram, there is one VQ SIP Server pair per DC. Having independent SIP Server pairs configured with the same switch is possible because we are not provisioning any real DNs on this switch. Only VQ DNs are on this switch. As a result, the SIP Server pair do not interfere with each other.

• One VQ SIP Server is deployed per DC.
• All VQ SIP Servers share the same VQ switch. Only VQ DNs are configured in the VQ switch.
• Each URS, ORS, and routing Stat Server instance is connected to all VQ SIP Servers in the environment.