Public Networking Scenarios - Nortel Enterprise Edge 2.0 Programming Manual

362 Appendix A: Network Examples
Customizing the 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 Enterprise Edge 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.
• Dialling restrictions can be added to lines in line pools. Filters can restrict the
use of the line to specific area codes.
• Host system signaling codes can be part of the dial out for a route. Routing can
also be used as an alternate method for a direct-dial number. 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

Public networking scenarios

The following scenarios illustrate various Enterprise Edge calls you can make with
public networking:
• Call one or more Enterprise Edge telephones
• Call Enterprise Edge and select tie lines to a private network
• Call Enterprise Edge and select lines to the public network
Enterprise Edge 2.0 Programming Operations Guide
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on page 363
on page 363
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