
276 Chapter 24 Dialing plans
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Why use destination codes?
Routes determine path (line or pool) and any required access numbers.
Destination codes determine which route to take (that is, 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.
Note: Destination codes must not conflict with the following:
• park prefix
• external code
• direct dial digit
•Auto DN
•DISA DN
• Private access code
• line pool codes
• telephone DN
• public target line received digits
• other destination codes
Note: You can enter destination codes up to a maximum of 12 digits.
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