Technical information

Glossary
GL-12 Issue 7 June 2001
UDP
Uniform Dial Plan
Uniform Dial Plan
A feature that allows a unique 4- or 5-digit number assignment for each terminal in a multi-switch
configuration such as a distributed communications system (DCS) or main-satellite tributary config-
uration.
V
VDN
Vector Directory Number
VF
Virtual Facility
VNI
Virtual Nodepoint Identifier
Vector Directory Number
An extension that provides access to the Call Vectoring feature on the switch. Call vectoring allows
a customer to specify the treatment of incoming calls based on the dialed number.
Virtual Facility
A call routing facility not defined by the physical facility (trunk) over which calls are routed.
Voice Terminal
A single-line or multi-appearance telephone.
W
War Dialer
Slang
. A device used by hackers that randomly dials telephone numbers (generally 800 numbers)
until a modem or dial tone is obtained.
WATS
Wide Area Telecommunications Service
WCR
World Class Routing
Wide Area Telecommunications Service
A service that allows calls to a certain area or areas for a flat-rate charge based on expected
usage.
World Class Routing
For DEFINITY ECS and DEFINITY G2.2 and G3, provides flexible network numbering plans.