Nortel BCM 3.7, Руководство пользователя

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562 Private networking with DPNSS
N0008589 3.3
Guidelines for creating a private numbering plan with DPNSS
Use the following guidelines when creating a private numbering plan with DPNSS.
• When creating HLCs for the nodes in your system, avoid numbering conflicts between
network nodes and internal DNs, Hunt group DNs.
• Program a Private Access Code into your destination routing tables to avoid conflicts with
your internal HLC and dest code numbering plan. For example, if a dialout HLC is 848, but
this number already exists in the Business Communications Manager system for an extension,
the routing tables should add a Private Access Code to the dest code. If the code is
programmed as 6, the dest code becomes 6848. 6848 uses a route to dial out 848 using the
DPNSS line pool, allowing the call to be placed.
Note that a Private Access Code is required only for specific DPNSS features such as
Diversion, Route Optimization, and Redirection.
Customizing the DPNSS routing service
You can customize the routing service using the following restrictions:
• Direct Inward Access (DIA) lines allow incoming calls on private circuits to be directed to
telephones without going through the normal call reception. Each DIA line is assigned to one
or more extensions and is given a distinct Private Received number. When someone on
another system on the network dials the Private Received number on a DPNSS line, the
Business Communications Manager system checks all received digits, compares the digits to
an internal table and routes the call to the appropriate DIA line. All extensions programmed to
have access to that DIA line will then alert for the incoming call.
• Dialing restrictions can be added to lines in line pools. Filters can restrict the use of the line to
specific area codes.
• You can use host system signaling codes as part of the dial out for a route. Routing can also be
used as an alternate method for a direct-dial digit. For example, create a destination code 0 and
program the number of the internal or external destination as the dial out. Digit absorption
should be set to 1. Because overflow routing directs calls using alternate line pools, a call may
be affected by different line restrictions when it is handled by overflow routing
.