Cisco Systems 5.x manual Addressing Options for Non-Networked Phone Systems

Chapter 2 Digital Networking

Digital Networking Concepts and Definitions

Subscribers on the Cisco Unity servers in the dialing domain can use the phone to send messages to and reply to messages from the subscribers on Unity 3, and vice versa. However, identified subscriber messaging is not available between the subscribers on Unity 3 and the subscribers on the Cisco Unity servers in dialing domain A.

Although subscriber extensions must be unique within a dialing domain, it is possible that subscribers who are associated with a Cisco Unity server outside of the dialing domain could have extensions that are the same as extensions used by subscribers who are associated with the servers within the dialing domain. In other words, it is possible that extensions may overlap in the global directory when there are Cisco Unity servers that are integrated with different phone systems.

Grouping the Cisco Unity servers into a dialing domain allows Cisco Unity to handle overlapping numbering plans. The dialing domain allows the subscribers within the dialing domain to use extensions to address messages without conflicting with the extensions of the subscribers on the other phone system. See the “How Cisco Unity Searches for a Matching Name” section on page 9-4and the “How Cisco Unity Searches for a Matching Number” section on page 9-4for a detailed description of how dialing domains shield against overlapping numbering plans.

Addressing Options for Non-Networked Phone Systems

If your organization has a separate phone system for each location, subscribers at one location dial a complete phone number, not just an extension, when calling someone at another location. When subscribers log on to Cisco Unity to send messages to subscribers on another Cisco Unity server, the number they enter when addressing the message depends on whether the Cisco Unity numbering plans overlap across locations, as described in the following sections.

When Numbering Plans Do Not Overlap

When Cisco Unity numbering plans do not overlap across locations—that is, when subscriber extensions are unique across locations—subscribers enter an extension when addressing a message to a subscriber who is associated with another Cisco Unity server.

As a convenience for subscribers, you may choose to add alternate extensions to each subscriber account. With alternate extensions, the number that a subscriber enters when addressing a message to someone at another location can be the same number that the subscriber dials when calling. When set up this way, subscribers do not need to remember two different numbers—one for calling a subscriber directly, and one for addressing a message.

For example, a subscriber, Kelly Bader, has subscriber extension 4060, as illustrated in Figure 2-2. Suppose that Chris, a subscriber at a remote location, dials 456-4060 to reach Kelly by phone. When Chris logs on to Cisco Unity to send a message to Kelly, he has to remember just to dial the extension (4060) and not dial the prefix (456) when addressing the message, rather than using the same number he dials to call Kelly. However, you could assign to Kelly the alternate extension 4564060. If this alternate extension has been set up, Chris can enter either 4060 or 4564060 when addressing a message to Kelly.

	Networking Guide for Cisco Unity Release 5.x (With Microsoft Exchange)
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