*** Telecom-related abbreviations ***
By: Captain B
For: 31337 Phreaking

PSTN- Public Switched Telephone Network
POTS- Plain Old Telephone Service
SS7- Signalling System 7
ESS- Electronic Switching System
TNI- Telephone Network Interface
ESN- Electronic Serial Number
WATS- Wide Area Telephone Service
DATU- Direct Access Test Unit
REN- Ringer Equivilence Number
PBX- Private Branch eXchange
PABX- Private Automatic Branch eXchange
ACTS- Automatic Coin Toll System
CO- Central Office
ANI- Automatic Number Identification
CID- Caller ID
DTMF- Dual Tone Multi-Frequency
MF- Multi-Frequency
COCOT- Customer Owned Coin Operated Telephone
ANAC- Automatic Number Announcement Circuit
VMS- Voice Mail System
VMB- Voice Mail box
ILEC- Incumbent Local Exchange Carrier
ISDN- Integrated Services Digital Network
DSL- Digital Subscriber Line
ADSL- Asymmetrical Digital Subscriber Line
KP- Key Pulse
ST- Start Transfer
CPE- Customer Premise Equipment
HAC- Home Area Code
SAI- Service Area Interface