MERLIN LEGEND Communications System Release 6.1 | | Issue 1 |
Network Reference 555-661-150 | | August 1998 |
3 Feature Interactions | | |
| System Renumbering | | Page 3-26 |
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| System Renumbering | 3 |
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A separate numbering plan is provided for non-local dial plan extensions, allowing system managers to enter the ranges of extensions on remote systems. These ranges are associated with patterns that in turn allow routing over private tandem trunks or over PSTN facilities when appropriate. These ranges must be unique and unambiguous in the local dial plan. Programming remote extension ranges does not affect the remote system or the extension numbering used within the remote system. When a system is renumbered to the factory-set default, non-local dial plan extension ranges are deleted.
NOTE:
Non-local dial plan programming can be used to route an extension’s calls to an outside number. This may be convenient when, for example, an extension user is working at home and wants to receive calls at a home telephone number.
Transfers of outside or non-local dial plan calls to non-local dial plan extensions are actually trunk-to-trunk transfers. Most extensions, including those equipped with single-line telephones, can make these calls, regardless of system programming for trunk-to-trunk transfer. The incoming call must be on a trunk with reliable disconnect. If a private network trunk is not available to carry the transferring call, the consultation call can be callback-queued on the first route, but the transfer must still be in progress.
If the system manager has prohibited an extension from making trunk-to-trunk transfers, it is still prevented from transferring inside or outside calls to another local system trunk connected to the PSTN. However, despite prohibitions, the following types of calls are allowed:
■A call on a private network trunk transferred to a non-local dial plan extension
■A call on an outside central office line/trunk (except on a loop-start line without reliable disconnect) transferred to a non-local dial plan extension
■A call on a private network trunk transferred to an outside central office line/trunk
A call transferred over a tandem PRI trunk to a non-local dial plan extension with an MLX display telephone does not receive the same call information that an inside transfer does. Only the extension number and label (if programmed) of the transferring extension are shown. However, most transfer functions operate normally between local and non-local dial plan extensions. Except when transfers are sent by or received by PassageWay Telephony Services clients with a CTI link. Users at these extensions must make manual transfers by using the telephones at their extensions.
