Norstar DR5, Installer'S Manual

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12 Benefits
Dialing outside the system
To restrict dialing outside the system (once a caller gains remote
access), you can apply dialing filters to incoming external lines
(as remote filters).
Remote
caller
Line
Filter
In this case, dialed digits must pass both the remote filter and the
line filter. A remote caller can override these filters by dialing the
DN and entering a Class of Service password.
For programming instructions, see the Programming chapter of
this Installer Guide.
Direct inward system access (DISA)
To control access from the public or private network, you can
configure auto-answer trunks to answer with DISA. Remote
callers hear a stuttered dial tone and must then enter a Class of
Service password that determines what they are allowed to do in
the system.
Auto-answer loop start and E&M trunks are configured to answer
with by default.
Note;’ You must have one Trunk Cartridge for every
two auto-answer loop start trunks.
Modular Installer Guide