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
• The expected length of each message that callers will record and that users will listen to.
• The number of users.
• The number of calls made for message notification.
• The number of MWIs that will be activated when call traffic is at its peak.
• The number of TRAP connections needed when call traffic is at its peak. (TRAP connections are
used by Cisco Unity Connection web applications to play back and record over the phone.)
• The number of calls that will use the automated attendant and call handlers when call traffic is at its
peak.
• Whether a Cisco Unity Connection cluster is configured. For considerations, see the
“Considerations for a Cisco Unity Connection Cluster” section on page 7.
It is best to install only the number of voice messaging ports that are needed so that system resources are
not allocated to unused ports.
The Number of Voice Messaging Ports That Will Answer Calls
The calls that the voice messaging ports answer can be incoming calls from unidentified callers or from
users. Typically, the voice messaging ports that answer calls are the busiest.
You can set voice messaging ports to both answer calls and to dial out (for example, to send message
notifications). However, when the voice messaging ports perform more than one function and are very
active (for example, answering many calls), the other functions may be delayed until the voice messaging
port is free (for example, message notifications cannot be sent until there are fewer calls to answer). For
best performance, dedicate certain voice messaging ports for only answering incoming calls, and
dedicate other ports for only dialing out.
If your system is configured for a Cisco Unity Connection cluster, see the “Considerations for a
Cisco Unity Connection Cluster” section on page 7.
The Number of Voice Messaging Ports That Will Dial Out
Ports that will only dial out can do one or more of the following:
• Notify users by phone, pager, or email of messages that have arrived.
• Turn MWIs on and off for user extensions.
• Make a TRAP connection so that users can use the phone as a recording and playback device in
Cisco Unity Connection web applications.
If your system is configured for a Cisco Unity Connection cluster, see the “Considerations for a
Cisco Unity Connection Cluster” section on page 7.
Caution In programming the phone system, do not send calls to voice messaging ports in Cisco Unity Connection
that cannot answer calls (voice messaging ports that are not set to Answer Calls). For example, if a voice
messaging port is set only to Send MWI Requests, do not send calls to it.