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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1316Dial Plan
20
■ Although extensions with the same first digit can have different lengths,
data-channel extensions must have the maximum number of digits to avoid
timeout problems for data calls that the switch automatically sets up, for
example, the Call Detail Recording (CDR) link.
■ An extension and a Feature Access Code (FAC) can share the same first
digit only if the extension is longer as long as they are not used for
Automatic Alternate Routing/Automatic Route Selection (AAR/ARS)
faxes. These extensions work only within the switch; they do not work as
remote uniform dialing plan (UDP) extensions.
Interactions
All dial-access features and services provided by the system require the dial plan.
■ Attendant Display and Telephone (Voice Terminal) Display
Prefixed extensions display without the prefix. The return call button
causes the prefix to dial, even though it does not display.
■ ISDN-BRI
When an ISDN-BRI station dials sufficient digits to route a call, but the call
could route differently if additional digits were dialed, the station does not
recognize the Conference or Transfer buttons. The user must delay dialing
for 3 seconds or dial # to indicate that the call can be routed based on the
digits already dialed. The Conference or Transfer buttons then are
recognized and the switch completes the operation.
■ MF Signaling
Flexible numbering is supported in countries using R2-MFC trunk
signaling without Group II tones. Different-length extensions can exist as
long as the extensions have different first digits.
■ Property Management System (PMS)
Remove prefixes before messages containing the extension are sent to the
PMS. Five-digit extensions do not exchange with PMS until modifications
are made to the PMS interface.
■ Uniform Dial Plan
The following limitations apply to a distributed communications system
(DCS) environment:
— Extensions that differ in length from the UDP do not distribute to
other switches.
— If the first two digits of an extension correspond to the floor number,
floors cannot be serviced by more than one switch.