For a Unity Connection cluster, you must know how the voice messaging ports function—which ports answer calls and which ports dial out (for setting MWIs and for sending message notifications). Depending on the function of the ports, you assign them to the applicable server in the Unity Connection cluster:
Beginning with the answering port that has the lowest number in its display name, assign half the answering ports to the subscriber server so that the subscriber server answer most incoming calls. Assign the remaining answering ports to the publisher server.
Dial-out ports (for MWIs and notifications)
Beginning with the dial-out port that has the lowest number in its display name, assign half the dial-out ports to the primary server so that the primary server handle MWIs and notification calls. Assign the remaining dial-out ports to the subscriber server.
For example, an eight-port system with six answering ports and two dial-out ports can be configured as follows.
Port Display Name
Under normal conditions, the Unity Connection cluster handles calls in the following manner:
The subscriber server answer most incoming calls. If no answering ports on the subscriber server are available, the publisher server answer calls.
The publisher server dial out for MWIs and notifications. If no dial-out ports on the publisher server are available, the subscriber server dial out for MWIs and notifications.
Ports Configuration for a Unity Connection Cluster
Command or Action
Unity Connection Administration, expand
Integrations and select
On the Search
Ports page, select the display name of the first voice messaging port in the
Unity Connection cluster.
All ports for all Unity Connection servers must appear on the
Search Ports page. Otherwise, the Unity Connection cluster has not been
correctly configured and does not function correctly.