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Feature Description
50003510 Revision A 143
Class of Service (COS)
Each extension, trunk, SUPERSET telephone, dataset, ACD position, or console is assigned
a Class Of Service (COS) which defines the features available for that device. All devices with
the same COS have access to the same features. Fifty Classes Of Service are available in the
system to provide 50 different levels of feature accessibility. Each COS can have a name
associated with it.
Clear All Features
An extension user may cancel all Call Forwarding, Do Not Disturb, and Callbacks Active at that
extension.
CO Line Group Key
The CO Line Group key allows the selection of an idle CO line from a CO line group. The key
accesses a group of CO lines without having a dedicated appearance for each line on the set.
Toll control is handled by ARS. The LCD or LED indicator corresponding to the key has no
function.
CO Line Key
The CO Line key originates and answers calls to or from parties outside the system. The key
accesses a specific trunk directly. A CO line key may be shared by up to 32 sets, but only one
may access it at a time. One other party can join in on a call on the line if the CO line is
non-private, or privacy is released.
CO Line - Select Direct
This feature allows a direct access to a specific CO trunk which may or may not appear on the
user’s telephone set. This feature must be accessed through any internal line.
CO Line Type - Direct Access - Bypass Key System Toll Control
This feature allows an extension seizing a CO trunk with a line key to bypass the system dial
tone and Key System Toll Control. Instead, dial tone from the CO is immediately received. This
allows users to hear stutter CO dial tone on their CENTREX lines, indicating the presence of
voice mail messages. Users may then access their voice mail or other CENTREX features or
they may dial an external destination number.
Conference
This feature allows a set user to establish a conference of up to five parties (including the
originating extension), without the assistance of the Attendant.
Conflict Dialing
The system can differentiate between conflicting extension numbers such as “52345” and
“5234”. This implies that extensions can be programmed as 1-, 2-, 3-, 4-, or 5 digit numbers
with the first digits being identical. The system selects the shorter extension number if the next