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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Call-Handling Scenarios
Page 2-90Network Configuration Scenarios
2
Non-Local Dial Plans and Facilities Planning 2
This section summarizes non-local dial plans, switch identifiers, UDP routing, and
ARS routing for each system. Not all details are provided for all facilities and
extensions. Remote access information has been discussed in earlier scenarios.
Table 2–23, page 2-92
shows some applicable extension ranges, patterns, and
routes for pooled facilities when people in one system call people at another
private network system. Some UDP routes are reserved for video and data calls.
System O users do not access video extensions on System N; these extensions
are not included in the System O non-local dial plan. Similarly, no high-speed 2B
data is sent from System N to System O. Any such data is reviewed at
headquarters (System A) before it is sent to back-office operations at System O.
To avoid numbering conflicts, system managers at Systems N and O program the
first 4 digits of the System A 5-digit DEFINITY ECS or DEFINITY ProLogix
Solutions extension numbers into their non-local dial plans. For example, one
extension number block on System A is 54400–54499 (see Table 2–23, page 2-
92). If the last four digits were programmed into the non-local dial plan extension
ranges of Systems O and N, the range would be 4405–4495, matching extension
numbers on System N. Therefore, this range would be denied on System N and
ambiguous on System O. Instead, users at all three systems dial System A
extensions in the same way, using five digits. Systems O and N simply route calls
on the first four digits dialed, and the fifth digit is sent to the DEFINITY ECS or
DEFINITY ProLogix Solutions system for local dial-plan routing. In this case,
dialed digits should be administered to 5.
NOTE:
DID (Direct Inward Dialing) and PRI dial plan routing supports routing to
1-to 4-digit numbers. If incoming calls must reach 5-digit DEFINITY ECS or
DEFINITY ProLogix Solutions system extension numbers, digit
manipulation can be performed via UDP routing. However, it is best if DID
lines are connected directly to the DEFINITY ECS or DEFINITY ProLogix
Solutions system.