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By WelshPaul
#4255
Do you know what PTSN, ITSP and POTS stand for? If you don’t, you're not alone. The world of VoIP (you should already know that one) is full of acronyms used to abbreviate the various systems and procedures and unless you’re involved in the industry, they can be a little hard to get your head around. So I put together of the most common VoIP-related acronyms:

AA - Auto Attendant
ADSL - Asymmetric Digital Subscriber Line
ASCII - American Standard Code for Information Interchange
ATA - Analog Telephone Adapter
BRI - Basic Rate Interface
BYOD - Bring Your Own Device
CID - Caller ID
CLEC - Competitive Local Exchange Carrier
CLI - Calling Line Identity
CNAM - Caller-ID Name
CDR - Call Detail Record
CODEC - Coder/Decoder
CPE - Customer Premise Equipment
DECT - Digitally Enhanced Cordless Telephone
DID - Direct Inward Dialling (a phone number)
DOS - Denial Of Service attack
DDOS - Distributed Denial Of Service attack
DHCP - Dynamic Host Control Protocol
DNS - Domain Name System
DNS SRV - DNS Service Lookup (IETF RFC2782)
DSL - Digital Subscriber Line
DTMF - Dual Tone Multi-Frequency
ENUM - E.164 Number Mapping
FAX - Facsimile/Telefacsimile/Telecopying
FOIP - FAX Over Internet Protocol
FXS - Foreign Exchange Station/Subscriber
FXO - Foreign Exchange Office
IAX - Inter-Asterisk eXchange Protocol
IEEE - Institute of Electrical and Electronics Engineers
IETF - Internet Engineering Task Force
ILEC - Incumbent Local Exchange Carrier
iNum - International Number (+883)
IP - Internet Protocol
IPv4 - Internet Protocol Version 4
IPv6 - Internet Protocol version 6
IP-PBX - Internet Protocol Private Branch Exchange
ISDN - Integrated Services Digital Network
ITSP - Internet Telephony Service Provider
ITU - International Telecommunications Union
IVR - Interactive Voice Response
LAN - Local Area Network
LDAP - Lightweight Directory Access Protocol
LNP - Local Number Portability
MOS - Mean Opinion Score
NAT - Network Address Translation
NPA - Numbering Plan Area (area code)
NTP - Network Time Protocol
PAID - P-Asserted ID
PBX - Private Branch Exchange
POE - Power Over Ethernet
POTS - Plain Old Telephone Service
PRI - Primary Rate Interface
PSTN - Public Switched Telephone Network
QOS - Quality Of Service
RPID - Remote Party ID
RTP - Real-time Transport Protocol
RTCP - Real-time Transport Control Protocol (IETF RFC3550)
SBC - Session Border Controller
SDP - Session Description Protocol
SIP - Session Initiation Protocol
SIT Tone - Special Information Tone
STUN - Session Traversal Utilities for NAT (IETF RFC5389)
TCP - Transmission Control Protocol
TCP/IP - Transmission Control Protocol/Internet Protocol
TFTP - Trivial File Transfer Protocol
UA - User Agent
UAC - User Agent Client
UAS - User Agent Server
UDP - User Datagram Protocol
URI - Universal Resource Identifier (IETF RFC2396)
URL - Universal Resource Locator (IETF RFC2396)
VAD - Voice Activation Detection
VoIP - Voice Over Internet Protocol
VSP - VoIP Service Provider
VSC - Vertical Service Code (*xx)
WAN - Wide Area Network
WiFi - Wireless Fidelity (WLAN)
WLAN - Wireless Local Area Network
WEBRTC - Web Real-Time-Communications (browser-to-browser Internet communications)

Note: This list is far from complete and is not meant to be exhaustive. It focuses primarily on what you might encounter when seeking out help and support with your VoIP setup.
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