Chapter 2 Digital Networking

Digital Networking Concepts and Definitions

A subscriber places a phone call to another subscriber, and then leaves a message

When the subscriber has logged on to Cisco Unity, Cisco Unity can identify the message as being from the subscriber, regardless of which Cisco Unity server the message recipient is homed on. In this case, the phone system is not involved and the recipient phone does not ring. Instead, the message is sent via Digital Networking.

Addressing Search Scopes

In addition to the automated attendant and directory handler search scopes mentioned above, a dialing domain provides a means to set the scope for searches that Cisco Unity performs in the following cases:

When a subscriber addresses a message

When members are being added to a public or private distribution list

By default, the addressing search scope used for the above searches is set to search only among subscribers on the local Cisco Unity server. You must expand the addressing search scope on each Cisco Unity server to either the dialing domain or the global directory to enable messaging between subscribers on different Cisco Unity servers. See the “Setting the Addressing Search Scope” section on page 2-6for information on how to expand the Addressing search scope.

Addressing Options for Subscribers in a Dialing Domain

After expanding the addressing search scope to either the dialing domain or the global directory, subscribers address messages to subscribers on other Cisco Unity servers the same way that they address messages to subscribers on the same Cisco Unity server: either by extension or by spelling the name.

Dialing Domains Shield Against Overlapping Numbering Plans

The two requirements for grouping Cisco Unity servers into a dialing domain are that the servers access the same global directory and are integrated with the same phone system. However, the minimum requirement for the basic messaging functionality provided by Digital Networking is that all of the Cisco Unity servers access the same global directory, as Figure 2-1illustrates.

Figure 2-1 Multiple Phone Systems But One Global Directory

M

Networked

phone system

Global directory

Dialing

domain A

Unity 1

Unity 3

Unity 2

Phone system

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Cisco Systems 5.x manual Addressing Search Scopes, Addressing Options for Subscribers in a Dialing Domain