| ACD | Automatic Call Distributor |
| ACS | Automatic Call Sequencer |
| ACW | After Call Work |
| AHT | Average Handling Time |
| AHT | Average Holding Time on Trunks |
| ANI | Automatic Number Identification |
| ARU | Audio Response Unit |
| ASA | Average Speed of Answer |
| ATA | Average Time to Abandonment |
| ATB | All Trunks Busy |
| BRI | Basic Rate Interface |
| CCR | Customer Controlled Routing |
| CCS | Centum Call Seconds |
| CD-ROM | Compact Disc - Read Only Memory |
| CED | Caller Entered Digits |
| CLI | Calling Line Identity |
| CO | Central Office |
| CPE | Customer Premises Equipment |
| CSR | Customer Sales or Service Representative |
| DN | Dialed Number |
| DNIS | Dialed Number Identification Service |
| DRT | Direct Response Television |
| FX | Foreign Exchange Line |
| GOS | Grade of Service |
| IS | Information Systems |
| ISD | Integrated Services Digital Network |
| IT | Information Technology |
| IVR | Interactive Voice Response |
| IXC | Inter Exchange Carrier |
| LAN | Local Area Network |
| LEC | Local Exchange Carrier |
| LED | Light Emitting Diode |
| MAC | Moves, Adds and Changes |
| MAN | Metropolitan Area Network |
| NCC | Network Control centre |
| NPA | Numbering Plan Area |
| OCR | Optical Character Recognition |
| PABX | Private Automatic Branch Exchange |
| PBX | Private Branch Exchange |
| PRI | Primary Rate Interface |
| PSTN | Public Switched Telephone Network |
| PUC | Public Utility Commission |
| RAN | Recorded Announcement Route |
| RFI | Request for Information |
| RFP | Request for Proposal |
| RSF | Rostered Staff Factor |
| TAPI | Telephony Applications Programming Interface |
| TCP/IP | Transmission Control Protocol/Internet Protocol |
| TSAPI | Telephony Services Application Programming Interface |
| TSF | Telephone Service Factor |
| TSR | Telephone Sales or Service Representative |
| UCD | Uniform Call Distributor |
| VRU | Voice Response Unit |
| WAN | Wide Area Network |
| WATS | Wide Area Telecommunications Service |
| WWW | World Wide Web |