User guide

14. Table of Abbreviations
Abbreviation Description
ATA Analogue Telephone Adapter
DECT Digital Enhanced Cordless Telecommunications
FXO Foreign Exchange Office
FXS Foreign Exchange Station
GSM Global System for Mobile communication
IAX (IAX2)
Inter- Asterisk eXchange protocol (version 2)
IETF Internet Engineering Task Force
ITU International Telecommunications Union
IVR Interactive Voice Response
NAT Network Address Translator
PBX (PABX) Private (Automatic) Branch Exchange
PCM Pulse Code Modulation
PSTN Public Switched Telephone Network
QoS Quality of Service
RFC Request For Comment
RTP Real-time Transport Protocol
SCCP Skinny Call Control Protocol
SIP Session Initiation Protocol
SS7 Signalling System 7
TA Telephone Adapter
UDP User Data Protocol
VoIP Voice over IP
VSAT Very Small Aperture Terminal
15. Document changes
2
nd
Edition (November 2007)
The following sections and Appendixes have been added:
• Section 6: Open Embedded Telephony Hardware
• Appendix A: Making IP Telephony knowledge accessible, - A pre-study of innovative
approaches
• Appendix B: The IP04 – Open telephony hardware for developing regions
• Reported bugs and typo fixes
Page 59 TRICALCAR | www.wilac.net/tricalcar – Version: February 2008