MERLIN LEGEND Communications System Release 6.1
Feature Reference
555-661-110
Issue 1
August 1998
Features
Page 131Centrex Operation
Figure 4. Full Centrex Service
Limited Centrex 3
With limited Centrex service, users depend principally on the communications
system’s features, but a limited number of prime lines can be used to access the
Centrex system. There are two key reasons for selecting limited Centrex:
â– Centrex lines/trunks may be less expensive than other lines.
â– Different users may have different needs for telephone service, so that
some users benefit more from Centrex while other users benefit more from
direct use of the communications system.
In the limited Centrex configuration, some extensions may have prime lines while
other extensions access the prime lines through a pool. Extensions can also be
assigned ground-start, tie, or DID lines, which is not possible to do with full
Centrex. In Hybrid/PBX mode, a telephone without a prime line can use a Pool
button to access Centrex facilities or can use an SA button to access pooled
facilities by dialing an access code. Once connected to a pool, users may dial
other Centrex extensions or dial an access code for outside calls. Outside calls
made by using an SA button to access a pool require two access codes for
outside calls: one for the pool and one for outside lines on Centrex.
For limited Centrex operation, the communications system must be in Key or
Hybrid/PBX mode. The total system operates on three levels, as shown in
Central Office
(Exter(External Calls)nal Calls)
Central Office
(External Calls)
Prim
e Lines
ime LinesPrim
e Lines
Access CodeAccess Code
MERLIN LEGEND
Communications System
• 2, 3, or 4-digit intercom
• Key Mode Features
Centrex Service
• 4-digit Centre 4-digit Centrex Callsx Calls
• Use of Centre Use of Centrex Featureseatures
Centrex Service
• 4-digit Centrex Calls
• Use of Centrex Features
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