AT&T 518-455-317 manual Changing Settings to Support PBX or Centrex Services, Recall Setting

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 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).

If your PBX or Centrex system includes dialing restrictions, use those instead of the equipment restrictions. If you have PBX or Centrex dialing restrictions on a line and also program equipment restrictions, both the PBX or Centrex system and equipment restrictions apply. However, equipment dialing permissions will not override PBX or Centrex system restrictions.

Speed Dial and Auto Dial Numbers

When you program numbers outside the PBX or Centrex system as Speed Dial and Auto Dial numbers, include the PBX or Centrex system dial-out code (9 on most PBX or Centrex systems), followed by a pause, in the stored number.

2-6Programming