MERLIN LEGEND Communications System Release 6.1 | Issue 1 |
Network Reference 555-661-150 | August 1998 |
5 Network Management | |
Non-Local Dial Plan Numbering | Page 5-16 |
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Non-local dial plan calls are routed over pools of private trunks using UDP routing. To maintain existing dial plans when systems are networked or when one system’s dial plan changes, UDP routing provides digit absorption and digit prepending, allowing dialed numbers to be modified before they are actually sent to the remote system. These techniques can be used to route DID and PRI dial- plan routed calls. For additional information about UDP routing, see “Switch Identifiers” on page 19.
When you specify a non-local extension range, the system verifies that extension numbers on the local system do not conflict with those programmed on a private networked switch. For example, if Extension 110 exists in the local system, Extension 1100 cannot be included in the extension range for a non-local private networked system. The local system also checks to see whether new extension number ranges conflict with existing ranges programmed for non-local systems.
In Release 6.0 V11 and later systems, when specifying a non-local extension range, you must also specify the number of dialed digits. This speeds call setup by allowing the system to route a call when the proper number of digits expected are received. An entry of 1-11 dialed digits is required; there is no factory setting.
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. In this example, the number of dialed digits is set to 5.
■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-digitDEFINITY ECS or DEFINITY ProLogix Solutions extensions from a MERLIN LEGEND Communications System, this method of routing should be used but it is recommended that DID facilities be connected directly to the local DEFINITY ECS or DEFINITY ProLogix Solutions systems. For details about UDP routing, see “Uniform Dial Plan Routing” on page 25 . In this example, the number of dialed digits is set to 4.
