Manual

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Cisco Unified Communications Manager Express SIP Trunk Integration Guide for Cisco Unity Connection Release 9.x
OL-20348-01
Planning How the Voice Messaging Ports Will Be Used by Cisco Unity Connection
Considerations for a Cisco Unity Connection Cluster
If your system is configured for a Cisco Unity Connection cluster, consider how the voice messaging
ports will be used in different scenarios.
When Both Cisco Unity Connection Servers Are Functioning Normally
• A hunt group is configured to send incoming calls first to the subscriber server, then to the publisher
server if no answering ports are available on the subscriber server.
• Both Cisco Unity Connection servers are active and handle voice messaging traffic for the system.
• In Cisco Unity Connection Administration, the voice messaging ports are configured so that an
equal number of voice messaging ports are assigned to each Cisco Unity Connection server. This
guide directs you to assign the voice messaging ports to their specific server at the applicable time.
• The number of voice messaging ports that are assigned to one Cisco Unity Connection server must
be sufficient to handle all of the voice messaging traffic for the system (answering calls and dialing
out) when the other Cisco Unity Connection server stops functioning.
If both Cisco Unity Connection servers must be functioning to handle the voice messaging traffic,
the system will not have sufficient capacity when one of the servers stops functioning.
• Each Cisco Unity Connection server is assigned half the total number of voice messaging ports.
If all the voice messaging ports are assigned to one Cisco Unity Connection server, the other
Cisco Unity Connection server will not be able to answer calls or to dial out.
• Each Cisco Unity Connection server must have voice messaging ports that will answer calls and that
can dial out (for example, to set MWIs).
When Only One Cisco Unity Connection Server Is Functioning
• The hunt group on the phone system sends all calls to the functioning Cisco Unity Connection
server.
• The functioning Cisco Unity Connection server receives all voice messaging traffic for the system.
• The number of voice messaging ports that are assigned to the functioning Cisco Unity Connection
server must be sufficient to handle all of the voice messaging traffic for the system (answering calls
and dialing out).
• The functioning Cisco Unity Connection server must have voice messaging ports that will answer
calls and that can dial out (for example, to set MWIs).
If the functioning Cisco Unity Connection server does not have voice messaging ports for answering
calls, the system will not be able to answer incoming calls. Similarly, if the functioning Cisco Unity
Connection server does not have voice messaging ports for dialing out, the system will not be able
to dial out (for example, to set MWIs).