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Uniform Dial Plan Features
Intersystem Calling
Call Handling for Non-Local Dial Plan Extensions
When a local user dials a remote extension included in the non-local dial
plan, he or she does so using an SA or Shared SA button. For the system user,
the call is like a regular inside call.
The system takes the following steps in order to execute and direct the call:
- The system consults the local dial plan to find the extension number. If
the number is not in the local plan, it searches the non-local dial plan.
When the called number is in the non-local plan, Step 2 takes effect.
- Outward and toll restrictions assigned to the calling extension are disregarded
so that the user can make this particular "outside" call. The extension's
FRL is compared to the UDP route FRL. The extension FRL must be equal to or
higher than the route FRL in order for the call to go through. If a Remote
Access user is making the call or if the call is to a non-local Remote Access
code programmed into the non-local dial plan, the barrier code FRL takes the
place of the extension FRL.
- The system locates the pattern associated with the extension number.
- The system finds the lowest-numbered available route for the call, beginning
with Route 1. If all available routes are busy, the caller may use Automatic
or Selective Callback to queue for Route 1 on the local system.
- The call is put through speedily. It may go through more than one system
before it is completed. For example, if a user on System A calls Extension
4551, the non-local dial plan may send the call to System B. If 4551 is not
in System B's local dial plan, it may be directed to a non-local dial plan
extension--in System C, for example.
- At the non-local dial plan extension, the call rings as an outside call.
If the user at the remote networked system has a 4400-Series, MLX, TransTalk
9040 (when connected to a TDL port), or ETR display telephone and the call
arrives on a PRI tandem trunk, the display can provide caller information
even for 5-digit extension numbers, such as MILLS Ext49312.
An MLS telephone shows OUTSIDE.The System Manager programs display
preferences to supply the extension number, programmed name label, or both.
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- Users at 4400-Series, MLX, TransTalk 9031/9040, Business Cordless
905, ETR, or MLS display telephones can receive incoming call information
for calls from non-local dial plan extensions, but only if the calls
arrive on PRI tandem trunks. A display preference feature enables
the display of extension number information, extension label (name)
information, or both, at display telephones. For more information,
see Display.
- 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.
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Transfers with consultation can be made across the network, but they cannot
be voice-announced. These transfers must be made using telephones; they cannot
be made by CTI-linked PassageWay Telephony services clients. Transfers between
extensions on different networked systems are actually trunk-to-trunk transfers.
Although transfers to non-local dial plan extensions can be made regardless
of trunk-to-trunk transfer prohibitions, such transfers made over tandem tie
trunks behave like trunk-to-trunk transfers, providing no transfer returns.
If the transfer is made over tandem PRI facilities and the non-local extension
is unavailable, the call returns to the transfer originator if the intended
destination is busy, invalid, or has Do Not Disturb active with no coverage.
UDP routing distributes intersystem calls among networked system users, as
well as DID and PRI dial plan routed calls that arrive from the public switched
telephone network and are routed across the network. It allows the System Manager
to prioritize routes used for calls and to set up special routes--for example,
distributing 2B data calls to remote videoconferencing systems. This routing
is distinct from the ARS and Remote Access features used when extensions on
one networked system make outside calls by using lines/trunks connected to another
system in the same private network. For detailed information on setting up network
tandem trunks, refer to the Network Reference.
