Administrator's Guide

Glossary and abbreviations
555-233-5062000 Issue 5 October 2002
UCL
Unrestricted call list
UDP
1. User Datagram Protocol - Transport layer; connectionless, unreliable, fast.
2. Uniform Dial Plan -A feature that allows a unique 4- or 5-digit number assignment for each terminal in a
multiswitch configuration such as a DCS or main-satellite-tributary system.
UL
Underwriter Laboratories
UM
User manager
UNMA
Unified Network Management Architecture
UNP
Uniform numbering plan
UPS
Uninterruptible power supply
USOP
User service-order profile
UUCP
UNIX-to-UNIX Communications Protocol
UUI
User-to-user information
V
VAL
Voice Announcements over the LAN
VAR
Value-added reseller
VDN
See vector directory number (VDN).
vector directory number (VDN)
An extension that provides access to the Vectoring feature on the switch. Vectoring allows a customer to spec-
ify the treatment of incoming calls based on the dialed number.
vector-controlled split
A hunt group or ACD split administered with the vector field enabled. Access to such a split is possible only
by dialing a VDN extension.
VIAS
Visually Impaired Attendant Service