Nortel Modular ICS 6.0, Руководство пользователя

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Using System features / 229
P0992640 03 Modular ICS 6.0 System Coordinator Guide
Controlling access to your Norstar system
It is important to maintain the security of your Norstar system
by limiting access to authorized users and limiting those users
to the features they need.
Direct inward system access (DISA)
Control access to your Norstar system with direct inward
system access (DISA). Access to your Norstar system from the
public telephone network should always be controlled with
DISA. If your installer or customer service representative
programs the line used for remote access to answer a call
automatically and wait for a DISA internal number, callers
hear a stuttered dial tone and must enter a Class of Service
password before they are allowed into the system.
Class of Service (COS)
To control the level of telephone service a remote user can
access, your installer can assign a remote filter and remote
package to the line used for remote access. The remote filter
restricts the numbers that can be dialed on the line, and the
remote package restricts the use of line pools and the page
feature. To change the restrictions for the line, the user can
enter their Class of Service (COS) password when the system
answers with DISA, or can dial the DISA internal number and
enter their Class of Service password.
Remote users can make long distance calls.
Remember that a remote user can make long
distance calls that are charged to your company and
can make page announcements in your office.