
220 Chapter 24 Dialing plans
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MCDN special call types: If your system is networked to other types of systems, such as
Meridian 1, which sends calls through one or more BCM systems to the public network, you need
to specify specific call-type codes. These codes append to the incoming dial string, so that the
call-type remains intact as it passes through the BCM call processing:
Internal feature access: Meanwhile, you need to keep in mind that the leading digit of any of the
above dialing codes cannot conflict with the other system access codes that you want to use:
Line pool and destination access codes: Once these basic numbers have been picked, you can
decide what numbers to use for line pool access codes and/or destination codes. The system will
not allow these codes to start with any of the numbers currently assigned. If you are working with
an established dialing plan, you may want to ensure that the numbers that the users are familiar
with dialing are reserved for these codes.
For instance, if the users are familiar with dialing 9XXXXXXX to access numbers outside of their
own offices, you will want to reserve this number for the destination codes. If you are setting up a
new system, you could opt to use the location codes of the other systems as destination codes, or
you could define one number for local calls (but which are still outside the system) and one
number for long-distance calls. For example: The users may dial 6<DN number> for calls within a
local system, but dial 8<area code><office code><extension or “DN”> for calls in another city
over the public network.
Telephones use pool codes and destination codes to dial externally, because when the analog
device goes off hook, it seizes internal dial tone from the system. The external access code, is
either a line pool code, or destination code assigned to your system dialing plan.
Variable Example or default
settings
Local Access Code 9 Coordinate these settings with Meridian
routing for these calls types and the
Private Access Code.
National Access Code 61
Special Access Code 911
Variable Example or default settings
Park Prefix 1 (101-125)
Direct Dial Digit 0
Variable Example or default settings
Line pool codes (first character) 5
Destination codes (first
character)
6<up to 11 more characters>
9<up to 11 more characters>
Variable Example or default settings
External code 9
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