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| ACD | Automatic Call Distribution |
| ANI | Automatic Number Identification |
| API | Application Programming Interface |
| ATM | Asynchronous Transfer Mode |
| BRI | Basic Rate Interface - ISDN 2 |
| CFTP | Continuous Fault Tolerant Processing |
| CLI | Calling Line Identity |
| CO | Central Office - USA term meaning Public Telephone Exchange |
| CCU | Central Control Unit |
| CPS | Carrier Pre-Selection |
| CPU | Central Processor Unit |
| CTI | Computer Telephony Integration |
| DASS | Digital Accessing Signalling System |
| DDI | Direct Dialling In |
| DISA | Direct Inward Signalling Access |
| DLL | Dynamic Link Library |
| DPNSS | Digital Private Network Signalling System |
| DR | Disaster Recovery |
| DSP | Digital Signal Processor |
| DTMF | Dual Tone Multiple Frequency or Touch Tone |
| FAB | Nothing - it's just FAB |
| FMS | Fax Messaging Server |
| GUI | Graphical User Interface |
| IR | International Rescue |
| ISV | Independent Software Vendor |
| IVR | Interactive Voice Response |
| LAN | Local Area Network |
| LCR | Least Cost Routing |
| LEM | Lunar Excursion Module |
| LAP | Local Area Paging |
| LD | Loop Disconnect |
| MAPI | Microsoft's Messaging API - Application Programming Interface |
| MF | Multi Frequency |
| MIS | Management Information System |
| MVIP | Multi Vendor Integration Protocol |
| NIC | Network Interface Cards |
| NTS | Novel Network Telephony Services |
| PABX | Private Automatic Branch Exchange |
| PBX | Private Branch Exchange |
| PC | Personal Computer |
| POT | Plain Ordinary Telephone |
| PRI | Primary Rate Interface - ISDN 30 |
| PSTN | Public Switched Telephone Network |
| PSU | Power Supply Unit |
| RAM | Random Access Memory |
| RAS | Remote Access Services |
| RISC | Reduced Instruction Set Computing |
| SCSA | Signal Computing Services Architecture |
| SIG | Spectrum Is Green |
| SMDI | System Management Data Information |
| SMS | Short Message Service |
| TAPI | Telephone Application Programming Interface - Microsoft's |
| TSAPI | Telephone System Application Programming Interface |
| CSTA | Computer Supported Telephony Application |
| CSTAPI | Computer Supported Telephony Application Programming Interface |
| TBR | Time Break Recall |
| TUI | Telephone User Interface |
| VMS | Voice Messaging Server |
| VAR | Value Added Reseller |
| VoIP | Voice over Internet Protocol |
| VPN | Virtual Private Network |
| WAN | Wide Area Network |
| ISDN | Integrated Services Digital Network |
| ISDN 2 | Basic Rate = 2 x 64Kbps
2B+D = 2 Channels of 64K also referred to as ''Bearer'' channels
and 1 referred to as ''Data'' or signalling Channel of 16K.
Total bandwidth is 128K. |
| ISDN 30 | Primary Rate = 32 x 64Kbps
30B + 2D Protocols: DASS II, DPNSS & ETSI Q931
32 Channels = 30 Channels of 64K referred to as ''Bearer'' Channels
and 2 referred to as ''Data'' or signalling Channels.
Total bandwidth of approximately 2 Megabits.
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| Notes | Total number of bits available = 2,048,000 - ie: 32 x 64 - ie 2 Meg. |
