Norstar DR5, Руководство по установке

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System features 173
Cancel Background Music
You can cancel Background Music.
1. Press .
Class of Service
The Class of Service for a call consists of all the features
and lines available to you for that call. This is determined by the
features assigned to the telephone in Administration
programming, including all Dialing Filters and Remote Access
Packages.
Users who need to dial numbers not permitted by the Class of
Service of the line or telephone that they are using, can switch to
a different Class of Service by entering a Class of Service
Password. Remote users can change the set of features
available to them by entering the DN followed by a Class of
Service password.
Internal numbers
Each telephone in the system has its own internal
number. The length of internal numbers in your system may be
from 2 to 7 digits for a non-expanded system or 3 to 7 digits for
an expanded system. All numbers in your system are the same
length. Your Installer sets the length of internal numbers (also
called the DN length) in Configuration programming.
To find out your internal number, use the Button Inquiry feature
on an internal line button. On the M7100
Telephone, Button inquiry shows your internal number followed
by the function assigned to your single memory button.
Lines
The following features and characteristics are associated with the
use of lines.
Modular System Coordinator Guide