Panasonic HYBRID IP-PBX KX-TDA200 - Manual (Page 350)

4.3 List of Abbreviations
350 Feature Guide
T
TAFAS Trunk Answer from Any Station
TEI Terminal Endpoint Identifier
TRG Trunk Group
TRS/Barring Toll Restriction/Call Barring
U
UCD Uniform Call Distribution
V
VM Voice Mail
VoIP Voice over Internet Protocol
VPN Virtual Private Network
VPS Voice Processing System
X
XDP eXtra Device Port