Lucent Technologies MERLIN LEGEND Release 5.0 Feature Reference page 153

MERLIN LEGEND Communications System Release 5.0
Feature Reference 555-650-110
Features
Centrex Operation
To use the features available through Centrex, dial a Centrex feature code from a
touch-tone telephone or analog data device. Some features must be programmed
for customers by the telephone company at the central office (CO). The system
can be configured for either full or limited Centrex service.
NOTE:
The system supports Centrex on loop-start lines only, not on ground-start
or ISDN facilities.
Full Centrex
Full Centrex requires that each extension have a direct Centrex line/trunk ( prime
line ) to the CO. Full Centrex can also be used when only some extensions have
prime lines, but the extensions without prime lines have limited ability to use
Centrex features. Prime lines can be shared between extensions.
The prime line allows users to dial outside numbers directly after dialing an
access code (usually
must be programmed by the telephone company.
The prime line is also used to call other 4-digit Centrex extension numbers that
may be located at different sites served by the same telephone company. The
communications system's intercom lines are used to dial other extensions in the
communications system.
With full Centrex, users can send a switchhook flash using the Recall or Flash
button. The fixed-function buttons (Hold, Drop, and Transfer) control Centrex
features rather than communications system features (additional buttons can be
programmed for communications system use). The communications system does
not intercept or respond to Recall or fixed-function button signals. See
''Recall/Timed Flash'' on page 511
For full Centrex operation, the system must be in Behind Switch mode. A full
Centrex configuration operates on three levels, as shown in
The extension user must be aware of the level where he or she is when making a
call or activating a feature.
). For this reason, any calling restrictions for the extension
9
for additional information.
3
Figure 4 on page
Issue 1
June 1997
Page 121
122.