| Abbreviation | Definition |
|---|---|
| EKTS | Electronic Key Telephone Set |
| E-LEAD | Ear Lead |
| ELEC | Enterprise Local Exchange Carrier |
| ELFEXT | Equal-Level Far-End Cross-Talk |
| ELL | Ethernet Leased Line |
| EM | Element Manager |
| EMI | Electro-Magnetic Interference |
| EML | Element Management Layer |
| EMLPP | Enhanced Multi-Level Precedence and Priority |
| EMS | Element Management System |
| EMTS | Emerging Markets Telecommunications Services |
| EMX | Earth and Magneto Signaling |
| ENFIA | Exchange Network Facilities for Interstate Access |
| ENST | Ecole Nationale Supérieure des Télécommunications |
| ENUM | E.164 NUmber Mapping |
| ENUM | tElephone NUmber Mapping |
| EOC | Embedded Operations Channel |
| EOF | End Of File |
| EONS | Enhanced Operator Name String |
| EOT | Eastern Oregon Telecom |