Lucent Technologies MERLIN LEGEND Release 6.1 Feature Reference page 763

MERLIN LEGEND Communications System Release 6.1
Feature Reference 555-661-110
Features
Uniform Dial Plan Features
Extensions included in ranges must be unique and unambiguous across
systems. In other words, if the local system includes extension 112 , that
system blocks the programming of a non-local extension range that
encompasses extension 1122 . If it allowed the range, calls to 1122 would
be misrouted because the system would send calls for extension 1122 to
extension 112 as soon as it received the first three numbers. In this
example, the local system prevents the numbering conflict. However, if the
local system is connected to more than one other networked system,
programmed extension ranges must assure proper routing. For example, if
the manager on System A must program extension ranges on two
connected systems, System B and C, the specified ranges on Systems B
and C must be unique and unambiguous. If System B includes the range
2030–2049, System C cannot include an extension range that
encompasses either extension 203 or extension 204.
MERLIN LEGEND Communications System dial plans may include 2-digit,
3-digit, or 4-digit extension numbers. However, DEFINITY ECS or
DEFINITY ProLogix Solutions users must dial four digits in order to reach a
MERLIN LEGEND Communications System extension in a network.
Although the MERLIN LEGEND Communications System can be
programmed to drop digit(s), use 4-digit dial plans in networks with
DEFINITY ECS or DEFINITY ProLogix Solutions.
When planning non-local extension ranges, PRI dial-plan routing and DID
numbers must be considered. If calls are routed across the network to
these numbers, they also must not conflict with extension ranges in other
network systems. In addition, UDP routes must specify correct digit
manipulation (deleting or adding digits). When such calls are routed to
5-digit DEFINITY ECS or DEFINITY ProLogix Solutions systems, special
considerations apply.
MERLIN LEGEND Communications System non-local dial plan numbering
specifies extensions up to four digits long, while DEFINITY ECS and DEFINITY
ProLogix Solutions systems may have 5-digit extension numbers. There are two
methods you can use to number DEFINITY ECS or DEFINITY ProLogix Solutions
non-local dial plan ranges to match the five digits. Choose one of the following
techniques, depending upon the actual extension numbers you are entering in
ranges and potential conflicts:
Specify ranges in MERLIN LEGEND that include the first four digits in the
extension numbers. Each number you enter in the range represents 10
numbers in the remote 5-digit system. For example, an extension range
entered as 4321 through 4322 represents remote extensions 43210
through 43229. Users actually dial five digits. The local system recognizes
the number range by the first four digits, but sends all five digits to the
DEFINITY ECS or DEFINITY ProLogix Solutions system.
Enter the last four digits and use UDP routing to prepend the first digit in
the DEFINITY ECS or DEFINITY ProLogix Solutions extension number.
The local system recognizes the number range using the last four digits.
Users dial only the last four digits. If DID calls must reach 5-digit DEFINITY
ECS or DEFINITY ProLogix Solutions extensions from a MERLIN
Issue 1
August 1998
Page 714