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Class o f Ser vice (COS)
Class of Service (COS)
Day/Night
Description
The system provides eight COSs for assignment of outside line dialing privileges. Each
system station may be assigned one Day COS and one Night COS. The station COS is
primarily used for restriction and control of long distance dialing. Toll restriction tables
allow customized dialing privileges to be assigned to any or all COSs. This COS is directly
referenced in the Restriction, CO Line Call Discrimination, Digit Interval Table
programming.
System Speed Dial is specially linked with COS such that all speed dial bins override toll
restriction programming in the toll restriction tables. It should be noted that stations
assigned COS (0-7) have access to all System Speed Dial Bins (600-699).
Stations assigned COS 6 can only access System Speed Dial Bins (20-39). Stations
assigned COS 7 have no access to System Speed Dial. COS affects the station override of
DND where a station with a lower level COS can be overridden by a station with a higher
level of COS. For instance, an extension with COS 0 may override a station with COS 1.
COS also affects the operation of Intrusion Release. Stations with equal or greater levels
of COS may join a busy CO line conversation when Intrusion Release is enabled. For
example, a station assigned COS 1 may join a CO line conversation with a station
assigned COS 1 or lower.
Operation
Station COS is assigned in system programming and is not a feature that requires specific
operating instructions. A station's COS will determine what digit sequences may be
dialed on CO lines. Refer to
Day Class of Service (COS)
Each station may be assigned one Class Of Service (COS) for the Day system mode of
operation. This COS is directly referenced in the Restriction, CO Line Call Discrimination,
Digit Interval Table programming. COS also dictates which stations will be given the
privilege of Overriding DND and joining an existing CO line conversation via the Intrusion
Release feature. COS 0 is considered the highest level where COS 7 is the lowest. COS also
dictates the stations ability to use System Speed Dial.
Default
DHS-L
station Day Class of Service is set to [0], and the range is 0-7.
The highest levelCOS is 0 (themost dialingprivilege) and the lowest COS level(leastdialing
privilege) is 7.
"Call
Chapt er 3 - Key Station Features, Opera tion, and Programming
Discrimination".
3-73
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