MERLIN LEGEND Communications System Release 6.1
Feature Reference
555-661-110
Issue 1
August 1998
Features
Page 138Centrex Operation
Analog Multiline Telephones 3
On analog multiline telephones, special ringing patterns differentiate various call
types. If personalized ringing is used, the personalized ring comes after the
distinctive pattern.
â– Centrex intercom calls are indicated by a beep followed by the
personalized ring.
â– Centrex special signaling is indicated by the facility-tracking tone.
â– Centrex special or priority calls are indicated by two short rings followed by
the personalized ring.
â– Outside calls are indicated by one short ring followed by the personalized
ring.
Single-Line Telephones 3
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, 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 telephone 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 using a 012, 016, or Off-Premises
Telephone (OPT) module. 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):
â– Centrex intercom calls are indicated by two-burst ringing.
â– Centrex special or priority calls are indicated by three-burst ringing.
â– Outside calls are indicated by three-burst ringing.
â– Centrex special signaling is not indicated.