Documentation Abbreviations Throughout this guide, the user will come across a number of abbreviations that
are common throughout the industry. The user should be familiar with the
following abbreviations:
ATPM Address Translation and Parsing Manager
CLI Command Line Interface
DSP Digital Signal Processor
DTMF Dual Tone Multi-Frequency
FXO Foreign Exchange Office
FXS Foreign Exchange Station
H.323 ITU specification for multimedia transmission over IP
networks
ICMP Internet Control Message Protocol
IMTC International Multimedia Telecommunications
Consortium
IP Internet Protocol
TVP-221H 4-port VoIP Gateway
TVP-224HR 4-port VoIP Gateway Router
KTS Key Telephone System
LAN Local Area Network
NVS Non-Volatile Storage
LED Light Emitting Diode
PBX Private Branch Exchange
PSTN Public Switched Telephone Network
RTP Real-Time Transport
TCID Telephony Channel Identifier
TFTP Trivial File Transfer Protocol
TIM Telephony Interface Modules
TNV Telephone Network Voltage
UDP User Datagram Protocol
UTP Unshielded Twisted Pair
VAD Voice Activity Detection
WAN Wide Area Network
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