Instruction manual

Central Office Provisioning
Dialing Plan
In general, the MERLIN LEGEND BRI system does not require connection of Centrex
lines. The need for Centrex service is determined by specialized business needs for
services offered by Centrex, or in some areas, local tariffing or availability issues may
require that BRI lines connected to the MERLIN LEGEND BRI system be Centrex-based.
For example, in one geographic area, mandatory Subaddress (SAR) option is
available only as a Centrex feature.
An example of a business need requiring a specialized dialing plan is the customer
who wants an arrangement where branch offices can be dialed using a less-than-
seven-digit number. This capability is made possible by ordering Centrex lines and
making use of Centrex groups and Individualized Dialing Plan (IDP).
The cost for Centrex services varies depending on local tariffs.
When an outgoing call is placed on a non-Centrex BRI line, the dialing sequence is
the same as on other types of lines (optional 1 + area code, followed by a seven-digit
number),
When an outgoing call to a destination not included in the Centrex group is placed
on a Centrex BRI line, the above mentioned dialing sequence must be preceded by
a “9. ” Branch offices or other organizations included in the Centrex group can be
reached by dialing an “extension number. ”
Basic Rate Interface (BRI) Provisioning Guide 11