Nortel BCM 3.7, Manual

Page: 899 / 1004

D 899
Programming Operations Guide
dialing plan
This is the overall numbering plan for your system that determines what numbers need to
be dialed to reach specific destinations, and what numbers need to be received to be
directed into the system, or through the system, in the case where the Business
Communications Manager is acting as a node on a tandem network. This plan consists of a
number of components, including the Public DN, the DN length, the received number and
the received number length, line pool and destination codes, network codes, access codes,
as well as the DNs for each telephones and piece of system equipment.
dialing restriction
See restriction filters.
DID
A Direct Inward Dial office setup provides each telephone with a dedicated number. The
incoming DID line has a range of numbers, and these are mapped to each telephone in the
system using target lines. Lines are set to auto answer so that you can forward unanswered
calls to a receptionist or to a voice mail system.
DiffServ
Differentiated Services (DiffServ) is a method of implementing QoS service for IP
networks. DiffServ is intended to improve network performance. Instead of applying
faster, more advanced technology, networks are managed by appropriate network policies.
With DiffServ there is a cost associated with higher quality services, and a risk with lower
quality services.
Digital Private Network Signaling System
See DPNSS.
direct-dial
This feature allows you to dial an assigned telephone in your system, or external to your
system, with a single digit. You can assign as many as five direct dial telephones in a
system. These telephones are configured under the Direct Dial heading (Services,
Telephony Services, General Settings).
Each telephone in the system has one direct-dial telephone. Each telephone can be
assigned a direct-dial set under Capabilities. (Services, Telephony Services, System DNs).
If Ringing service schedules are active on the system, an additional direct dial telephone
can be identified, for example, a night security desk.
direct-dial digit
This is a single, system-wide digit for calling the assigned direct-dial telephone of any
telephone. This digit is defined under Access codes. (Services, Telephony Services,
General settings)
directed pickup
See call pickup directed.