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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Call-Handling Scenarios
Page 2-6Networking Guidelines
2
Non-Local DEFINITY ECS or DEFINITY
ProLogix Solutions Systems 2
DEFINITY ECS and DEFINITY ProLogix Solutions communications systems can
support either 4- or 5-digit dial plans. However, 5-digit extension ranges cannot be
programmed into a MERLIN LEGEND Communications System non-local dial
plan. With possible extension numbering conflicts in mind, handle 5-digit
extension numbers by using one or both of the two methods explained below.
■ Program the
first
four digits of the extension number ranges into the non-
local dial plan, for example 1234–1236 for remote extensions
12340–12369. Because ranges are programmed and not necessarily
individual extensions, this may not present problems. However, this
method does not work when you need to stipulate ranges of fewer than ten
numbers. Aside from this consideration, this method is usually the better of
the two techniques. Users dial 5-digit extension numbers to reach non-local
users at DEFINITY ECS or DEFINITY ProLogix Solutions systems, and
they dial the same extension numbers as the DEFINITY ECS or DEFINITY
ProLogix Solutions users do within their own system. A MERLIN LEGEND
Communications System consults the non-local dial plan to route, based
on the first four digits, but sends the fifth digit to the DEFINITY ECS or
DEFINITY ProLogix Solutions system for handling. “Scenario 5: Large
System Hub” on page 88 provides an example.
For Release 6.0 systems earlier than Version 11, when this method is
used, a MERLIN LEGEND Communications System user must dial the fifth
digit of a non-local DEFINITY ECS or DEFINITY ProLogix Solutions
extension number within two seconds of dialing the fourth digit.
For Release 6.0, Version 11 and later systems, programming the number
of dialed digits as 5 makes this restriction unnecessary and speeds call
setup time.
■ Program the
last
four digits of the extension number ranges into the non-
local dial plan, for example 2340–2369 for extensions 12340–12369. Then,
when you assign UDP routes to the patterns, program the number of
dialled digits as 4 (Release 6.0 Version 11 and later system only), and use
the Other Digits system programming setting to prepend the first digit,
which in this example is a 1. If it is necessary to route PSTN Direct Inward
Dialing (DID) or PRI dial-plan routed calls through a MERLIN LEGEND
Communications System to a DEFINITY ECS or ProLogix Solutions
system with 5-digit numbering, you must use this method.
NOTE:
It is best to connect DID trunks directly to DEFINITY ECS or
DEFINITY ProLogix Solutions systems instead of MERLIN LEGEND
Communications System for local routing.
In larger private networks, the second method may cause more numbering
conflicts than the first method. You must consider the second digit(s) of DEFINITY
ECS or DEFINITY ProLogix Solutions extension numbers to avoid confusion and
ambiguity. Extensions 12345 and 2345, for example, are ambiguous when the 1