| Term | Definition |
|---|
| Modified Final Judgement | MFJ |
| Regional Bell Operating Center | RBOC |
| incumbent local exchange carrier | ILEC |
| Competitive Local Exchange Carrier | CLEC |
| Dual-Tone Multi-Frequency | DTMF |
| North American Numbering Plan | NANP |
| Off Premises Extension | OPX |
| Foreign Exchange | FX |
| Customer Premises Equipment | CPE |
| Central Office | CO |
| Private Branch Exchange | PBX |
| Direct Inward Dial | DID |
| Direct Outward Dial | DOD |
| Common Channel Signaling | CCS |
| Pulse Code Modulation | PCM |
| Time Division Multiplexing | TDM |
| Phase Modulation | PM |
| Amplitude Modulation | AM |
| Frequency Modulation | FM |
| Space Division Multiplexing | SDM |
| Main Distribution Frame | MDF |
| Digital Loop Carrier | DLC |
| Network Termination Device | NTD |
| Outside Plant | OSP |
| Federal Communications Commission | FCC |
Combine with other sets
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