AT&T MDC 9000 Specifications download pdf (Page 25)

Swapping Extensions

If a user changes location, but wants to keep the same extension number, you

can make the change easily by changing the connection at the control unit.

For example, if the users at extensions 29 and 32 switch offices, you can

disconnect the modular plug from extension jack 29 in the control unit, and

reconnect it at extension jack 32. Likewise, reconnect the cord that was

connected to extension jack 32 at its new location, extension jack 29. Then, the

users can take their respective phones to their new locations, keep the same

extension numbers, and retain the phones’ programmed settings.

Changing Settings to Support

PBX or Centrex Services

This section applies only if you use PBX or Centrex services with your system, If

it does not apply, go to the next section, “System Programming Options.”

■ PBX services are provided by a private telephone switch.

■ Centrex services are provided by your local telephone company from a

Central Office (CO) outside your premises. These services include the

Centrex lines connected to your control unit modules and some set of

features—such as hold, conference, or transfer—that are available on

those lines. Centrex services may be offered in your area under a

different name. For specific Centrex features to be available to you, your

company must subscribe to those features. For specific information on

using Centrex, see the Centrex documentation provided by your local

telephone company.

Some of the issues you should consider when setting up your system to work

effectively behind a PBX or Centrex system are discussed below. Chapter 5

explains how to use the programming procedures discussed here.

Recall Setting

To set up your equipment to work properly with a PBX or Centrex system, first

set Recall Timer Duration (#107) to match the setting used by your PBX or

Centrex system (usually 800 msec., or “32”). This setting affects the length of a

Recall signal sent by the control unit to access PBX or Centrex services.

Dialing Restrictions

Outgoing Call Restriction (#401) is an equipment restriction intended to limit

an extension’s dialing to “inside calls only” (using the [

Intercom ] buttons on system

phones) or to “inside and local calls only” (allowing calls within the PBX or

Centrex system and local calls outside the PBX or Centrex system). However, if

users in your system use a dial-out code (9 on most PBX or Centrex systems)

before dialing numbers outside the PBX or Centrex system, the equipment will

not be able to prevent toll calls for extensions restricted to “inside and local calls

only” (unless you use Disallowed Phone Number Lists to prevent dialing to

specific classes of numbers).

2-6 Programming

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AT&T MDC 9000 Specifications Page 25

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