Nortel BCM 3.7, Manual

Page: 339 / 1004

Using destination codes 339
Programming Operations Guide
Why use destination codes?
Routes determine path (line or pool) and any required access numbers.
Destination codes determine which route to take (i.e. an end node uses one destination code for all
other nodes in the system). If you choose to use the destination codes Normal schedule, the call
will always go out over the same route. If you choose to use the other destination codes schedules,
you can set up a more responsive plan, whereby calls can go out over more than one route, based
on scheduled times.
Destination codes provide you with the opportunity to create a dialing plan that allows users to
connect to other systems in a relatively seamless or consistent manner, regardless of the lines or
routes that are being used to get there. For example, connecting through VoIP lines requires
significantly different ways of dialing than dialing over T1 lines. However, you can configure
destination codes, such that the user dials the same number of digits regardless of the trunks over
which the calls are routed.
Figure 101 Using destination codes to access another system
User dials
9-1-601-555-2222
9-1-601-555-2222
91 is a destination
code – system uses
Route 001 and Line
Pool A
Routing tables
absorb 9
1-601-555-2222
Dialout programming tells the
system to add the access
code for long distance
(e.g. 10222)
10222-1-601-555-2222
External lines recognize the
long distance access code and
switch to the appropriate
carrier
1-601-555-2222
Call is directed in
the public system