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1.15 Optional Device Features
110 Feature Guide
Permitted
Outside-to-Outside (CO-to-CO) Line Calls through DISA
DISA callers can use DISA to make outside (CO) line calls when allowed by the DISA security mode.
If a call between 2 outside parties is established via DISA, the length of the call can be limited to a
preprogrammed duration ( CO-to-CO Line Call Duration [205]). A timer will activate when the call is
connected, and a warning tone will be heard 15 seconds before the timer expires. When the timer expires,
the call is disconnected ( 1.10.8 Outside (CO) Line Call Limitation).
To detect the end of an outside-to-outside (CO-to-CO) line call, Calling Party Control (CPC) Signal Detection
can be assigned through system programming ( CPC Signal Detection—Incoming [420], CPC Signal
Detection—Outgoing [421]).
Security Mode Intercom Calls Outside (CO) Line Calls
All Security
Trunk Security
No Security