Lucent Technologies MERLIN LEGEND Release 5.0 Feature Reference page 158

MERLIN LEGEND Communications System Release 5.0
Feature Reference 555-650-110
Features
Centrex Operation
Mode Differences
Hybrid/PBX Mode
Hybrid/PBX mode can be used only in a limited Centrex configuration. In
Releases prior to 2.0, a switchhook flash can be sent to the Centrex service only
when the prime line is terminated either on a personal line or, when prime lines
are shared, on a Pool button. Accessing a prime line through an SA button does
not allow the switchhook flash to be sent to the Centrex service.
In Release 2.0 and later systems, Centrex lines active on an SA button (including
a Shared SA button) can use Recall or switchhook flash.
Tie, WATS, and T1 lines can be used in pools. They can be used only as personal
lines with Centrex service in Key and Behind Switch modes.
Key Mode
Key mode can be used only in a limited Centrex configuration.
Key mode avoids the requirement that each extension have a prime line or shared
prime line to make Centrex calls. It allows the use of an ICOM button for access to
Centrex lines. It also allows the use of tie, WATS, and T1 lines as personal lines.
In releases prior to Release 2.0, a switchhook flash can be sent to the Centrex
service only when the line is terminated on a personal line. Accessing the same
line through an ICOM button does not allow the switchhook flash to be sent to the
Centrex service.
In Release 2.0 and later systems, Centrex lines active on an ICOM button can use
Recall or switchhook flash.
Behind Switch Mode
For full Centrex configuration, the communications system must be in Behind
Switch mode.
Behind Switch mode does not support MERLIN MAIL, MERLIN LEGEND MAIL,
AUDIX Voice Power, Call Accounting System (CAS), or Call Management System
(CMS). These applications are supported only in Key and Hybrid/PBX modes.
Full Centrex service supports only loop-start facilities. While lines that are not
loop-start lines are not blocked by the communications system, they can cause
dialing errors. Even random use of modules that are not loop-start (such as E&M
modules) throws off the default line assignments. If boards other than loop-start
boards must be used, they must be positioned after the last loop-start line module,
or prime lines on later modules may be assigned incorrectly. If a DS1 module is
used, it must be placed after all other loop-start boards on the system so that
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Issue 1
June 1997
Page 126