we have two CUC (pub/sub) in two different main locations with total of 48 ports. there are also five remote locations. I need some design guide for ports assignment for each main locations and remote locations for voicemail and auto attendant.
These are usually configured 50/50 in case one server fails.
Voice Messaging Port Configuration for a Connection Cluster
For a Cisco Unity Connection cluster, you must know how the voice messaging ports will function—which ports will answer calls and which ports will dial out (for setting MWIs and for sending message notifications). Depending on the function of the ports, you will assign them to the applicable server in the 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 will 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 will 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 Cisco Unity Connection cluster will handle calls in the following manner:
•The subscriber server will answer most incoming calls. If no answering ports on the subscriber server are available, the publisher server will answer calls.
•The publisher server will dial out for MWIs and notifications If no dial-out ports on the publisher server are available, the subscriber server will dial out for MWIs and notifications.
Before programming the phone system, you need to plan how the voice messaging ports will be used by Cisco Unity Connection. The following considerations will affect the programming for the phone system (for example, setting up the hunt group or call forwarding for the voice messaging ports):
•The number of voice messaging ports installed.
For a Cisco Unity Connection cluster, each Cisco Unity Connection server must have enough ports to handle all voice messaging traffic in case the other server stops functioning. The Cisco Unified CM server must have enough ports installed for all Cisco Unity Connection servers.
•The number of voice messaging ports that will answer calls.
•The number of voice messaging ports that will only dial out, for example, to send message notification, to set message waiting indicators (MWIs), and to make telephone record and playback (TRAP) connections.
The following table describes the voice messaging port settings in Cisco Unity Connection that can be set on Telephony Integrations > Port of Cisco Unity Connection Administration.
Table 2-1 Settings for the Voice Messaging Ports
Check this check box to enable the port. The port is enabled during normal operation.
Uncheck this check box to disable the port. When the port is disabled, calls to the port get a ringing tone but are not answered. Typically, the port is disabled only by the installer during testing.
(For Cisco Unity Connection clusters only) Click the name of the Cisco Unity Connection server that you want to handle this port.
Enter the extension for the port as assigned on the phone system.
Check this check box to designate the port for answering calls. These calls can be incoming calls from unidentified callers or from users.
Perform Message Notification
Check this check box to designate the port for notifying users of messages. Assign Perform Message Notification to the least busy ports.
Send MWI Requests
Check this check box to designate the port for turning MWIs on and off. Assign Send MWI Requests to the least busy ports.
Allow TRAP Connections
Check this check box so that users can use the phone as a recording and playback device in Cisco Unity Connection web applications. Assign Allow TRAP Connections to the least busy ports.
Outgoing Hunt Order
Enter the priority order in which Cisco Unity Connection will use the ports when dialing out (for example, if the Perform Message Notification, Send MWI Requests, or Allow TRAP Connections check box is checked). The highest numbers are used first. However, when multiple ports have the same Outgoing Hunt Order number, Cisco Unity Connection will use the port that has been idle the longest.
Click the applicable security mode:
•Non-secure—The integrity and privacy of call-signaling messages will not be ensured because call-signaling messages will be sent as clear (unencrypted) text and will be connected to Cisco Unified CM through a non-authenticated port rather than an authenticated TLS port. In addition, the media stream will not be encrypted.
•Authenticated—The integrity of call-signaling messages will be ensured because they will be connected to Cisco Unified CM through an authenticated TLS port. However, the privacy of call-signaling messages will not be ensured because they will be sent as clear (unencrypted) text. In addition, the media stream will not be encrypted.
•Encrypted—The integrity and privacy of call-signaling messages will be ensured on this port because they will be connected to Cisco Unified CM through an authenticated TLS port, and the call-signaling messages will be encrypted. In addition, the media stream will be encrypted.
Determining How Many Voice Messaging Ports to Install
The number of voice messaging ports to install depends on numerous factors, including:
•The number of calls Cisco Unity Connection will answer when call traffic is at its peak.
•The expected length of each message that callers will record and that users will listen to.
•The number of users.
•The number of ports that will be set to dial out only.
•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.
When Both Cisco Unity Connection Servers Are Functioning Normally
•The phone system is provisioned with twice the number SCCP voice mail port devices needed to handle the voice messaging traffic.
•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 assigned in the following manner:
–The subscriber server answers most incoming calls for the system.
–The publisher server handles most dial-out calls (MWI requests and notifications).
This guide directs you to assign the voice messaging ports to their specific Cisco Unity Connection server at the applicable time.
•The voice messaging ports on both Cisco Unity Connection servers are registered with the phone system.
•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.
If Only One Cisco Unity Connection Server Is Functioning
•The SCCP voice mail port devices on the phone system are unregistered from the voice messaging ports on the Cisco Unity Connection server that stopped 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).
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).
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