Lucent Technologies MERLIN LEGEND Release 7.0 Feature Reference page 215

MERLIN LEGEND Communications System Release 7.0
Feature Reference 555-670-110
Features
Centrex Operation
Centrex special or priority calls are indicated by two short rings followed by
the personalized ring.
Outside calls are indicated by one short ring followed by the personalized
ring.
Single-Line Telephones
When single-line telephones are used in Behind Switch mode, a prime line is
assigned automatically to the extension.
Centrex service supports only touch-tone telephones.
When single-line telephones are connected directly to a prime line, they have
limited functionality because they cannot access communications system features
or make intercom calls. They can, however, use all the Centrex features by dialing
the proper access codes.
If a single-line telephone has the Idle Line Preference programmed for an ICOM
Ring button, all communications system features are available. You can access
Centrex lines and features by dialing the Centrex access code. With a single-line
telephone, however, you cannot use the communications system's Conference,
Transfer, or Drop, because the switchhook flash goes directly to the Centrex line
and is not intercepted or interpreted by the communications system.
Single-line telephones should be connected by using a 012 (T/R), 016 (T/R), or
Off-Premises Telephone (OPT) module, or, in Release 7.0 and later systems, to
412 LS-ID-ETR or 016 ETR module ports that have been programmed for tip/ring
operation. If a single-line telephone is connected to an MFM, it cannot send a
switchhook flash.
In Hybrid/PBX mode, special ringing patterns are used on single-line telephones
to differentiate various call types (personalized ringing is not available):
Centrex intercom calls are indicated by two-burst ringing.
Centrex special or priority calls are indicated by three-burst ringing.
Outside calls are indicated by three-burst ringing.
Centrex special signaling is not indicated.
Issue 1
April 1999
155