
MERLIN LEGEND Communications System Release 7.0
System Programming
555-670-111
Issue 1
April 1999
Programming Procedures
3-31
System Renumbering
3
Non-Local Dial Plan Extension Ranges
3
In Release 6.0 and later systems (Hybrid/PBX mode only), the system manager
can enter ranges of extensions for non-local systems networked to the local
MERLIN LEGEND Communications System. The process does not affect
programming on non-local systems, each system must be individually
programmed.
In Release 6.1 and later systems, the maximum number of digits (1 to 11) the user
can enter to reach an extension on the non-local system is specified for each
non-local dial plan extension range. This accelerates dialing by allowing call
processing to act immediately when the number of digits entered equals the
number specified.
This topic describes the following procedures:
■
Specifying new extension number ranges
■
Deleting extension number ranges
The extension ranges you enter using this procedure are the numbers that users
on your system dial in order to make System Access (SA) calls to users on the
non-local system. Users dial these calls in the same way that they dial inside calls
on your local system. In most cases they should be the same numbers that users
in the non-local system dial to reach one another. Numbering must be planned to
avoid conflicts and provide unambiguous extension numbers across private
networks.
NOTE:
It is recommended that all extensions in a range be of the same length to
help minimize call processing times. For private networks that include
Centralized Voice Messaging, it is recommended that all extensions in the
private network be of the same length. See the
Network Reference
for
additional considerations.
Non-local dial plan calls are routed over pools of private trunks using UDP routing.
Maintaining existing dial plans when systems are connected in a private network
may not be possible due to ambiguity or when one system’s dial plan changes.
UDP routing using digit absorption and digit prepending, which allow dialed
numbers to be modified before they are actually sent to the remote system, may
help to minimize changes. However, this will quickly increase dial plan complexity
for private network UDP calls and can affect Centralized Voice Messaging
operation. Therefore, these techniques should not be used except in special
cases for non-local private network UDP calls. Deleting and prepending digits are
very useful methods and are easily set up for routing non-local dial plan calls over
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