Instruction manual

Features
Single-Line Telephones
When single-line sets are used in Behind Switch mode, a Prime Line is assigned
automatically to the station if there are enough lines.
Centrex Service supports only touch-tone telephones
When single-line sets are connected directly to a Prime Line, they have limited
functionality because they cannot access communications system features or
make inside calls. They can, however, use all the Centrex features by dialing the
proper access codes.
If the single-line set has the Idle Line Preference programmed for an ICOM-
Ring button, the user has complete use of all communications system features.
Access to Centrex lines and features is gained by dialing the Centrex access
code. However, a single-line set cannot use the communication system
conference, transfer, or drop because the switchhook flash goes directly to the
Centrex line and is not intercepted or interpreted by the communications
system.
It is recommended that single-line sets be connected via an 012 or OPT
module. If an single-line set is connected to a MFM, it cannot do a switchhook
flash,
In Hybrid/PBX mode, special ringing patterns are used on single-line sets to
differentiate various call types. Personalized Ringing is not available.
■ Centrex intercom calls are indicated by 2-burst ringing.
■ Centrex special or priority calls are indicated by 3-burst ringing.
■ Outside calls are indicated by 3-burst ringing.
■ Centrex special signaling is not indicated.
Feature Interactions
Calling
Centrex users should not be assigned Calling Restrictions because the
Restrictions
system prevents a telephone with Calling Restrictions from sending a
switchhook flash to the CO. Calling restrictions should be placed at the
Centrex.
Conference
In Behind Switch mode, the fixed function Conference button applies to
Centrex operation and is not recognized by the communications
system. A button can be programmed for communications system
Conference.
Drop In Behind Switch mode, the fixed function Drop button applies to
Centrex operation and is not recognized by the communications
system. A button can be programmed for communications system Drop.
Centrex Operation 91