19
Behind PABX Operation
Description
The G Series digital telephone systems can operate as "Behind PABX" or Centrex Operation. In this
mode, the system makes allowances for connection to other than a normal Central Office Line. The
primary differences have to do with the operation of Station Message Detail Recording (SMDR) and Toll
Control. See Station Message Detail Recording, page 160 of this document and Toll Control, page 169 of
this document.
Conditions
Lines programmed as PABX lines will be treated differently for purposes of Toll Control. If, when on a line
programmed as PABX, the digit programmed in Mode 05-03-04 is not dialed as the first digit, an inside
PABX call is assumed and no Toll Restriction is applied.
Programming
PABX (Centrex) Outgoing Code, Mode 05-03-04 must be programmed to correspond to the access code
used to access a CO line on the PABX, i.e., if [9] is used to access a Trunk on the PABX, [9] should be
programmed as the PABX (Centrex) Outgoing Code on Mode 05-03-04. The valid parameters are listed
below:
PABX Outgoing Code, (Mode 05-03-04 )
0=0
1=1
2=2
3=3
4=4
5=5
6=6
7=7
8=8
9=9
CO Line Type, Mode 35-[TK]-01 must be set for PABX operation for the system to recognize operation
behind PABX. Valid parameters are:
CO Line Type, (Mode 35-[TK]-01)
0=CO Line
1=PABX Line
Note:
It is not necessary to program lines as PABX for them to operate behind PABX systems. Behind
PABX operation is a convenience that provides the ability to continue to effectively track Toll
Control without the need to assess the impact of a PABX access code.
Should an installation occur where there is no need for Toll Control, it may be easier for installation
personnel to ignore the behind PABX programming of the system.
Operation
Behind PABX Operation is fully automatic.
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