Nortel Compact ICS 7.1, Coordinator Manual

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Using System features / 229
N0130955 01 Compact ICS 7.1 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, a remote user can make long distance
calls that are charged to your company and can
make page announcements in your office unless
you create the proper restrictions for external
access lines.