Direct Inward System Access (Disa); Coordinated Dialing Plans; Dialing Plan Using Public Lines - Nortel Enterprise Edge 2.0 Programming Manual

Direct inward system access (DISA)

To control access from the public or private network, you can configure
auto-answer trunks to answer with DISA. Remote callers hear a stuttered dial tone
and must then enter a COS password that determines what they are allowed to do in
the system.
Auto-answer T1 loop start and T1 E&M trunks are configured to answer with DISA
by default. For DISA programming instructions.

Coordinated dialing plans

Enterprise Edge has a routing feature that allows you to set up a coordinated dialing
plan with other systems in the public network. The goal is to have a network-wide
dialing plan where all telephone numbers are unique and of a uniform length.
Coordinated dialing plans are typically used with a network of systems with a three
to seven digit dialing access between them.
Any programming for routing should be carefully planned using tables. For more
information about routing and destination codes, see
This section deals with applying the programming in network situations.
For more information on Enterprise Edge dialing plans, refer to:
•

Dialing plan using public lines

• Dialing plan using T1 E&M lines
• Dialing plans with shared line pools
Dialing plan using public lines
The following illustrations provide an example of how you might record dialing
plan information in a spreadsheet. The example shows dialing plan information for
a Toronto system in a network of three offices: Toronto, Halifax and Vancouver.
Without routing, an Enterprise Edge user in Toronto would have to select a line pool
and dial 1-902-585-3027 to reach extension 27 in Halifax (902). By creating a
destination code of 30 and creating a route that uses the proper line pool and dial
out number (referred to as "External #" in programming), the user simply dials
3027. The same feature is available for Vancouver (604).
In the column Dial out, P stands for pause, a host system signaling option. Press
ƒ‡°
P0911588 Issue 01
Tips
T1 DID trunks cannot be configured to answer with DISA. If you want
incoming T1 DID calls to be answered with DISA, configure the system with a
DISA DN. Incoming T1 DID calls that map onto the DISA DN are then routed
to a line that has DISA.
on page 335
to insert a 1.5 second pause in the dialing string.
Enterprise Edge 2.0 Programming Operations Guide
Appendix A: Network Examples 335
Routing Service
on page 337
on page 340
on page 142.