| Abbreviation | Definition |
|---|---|
| IWW | Internet World Wireless conference |
| IXC | Inter-eXchange Carrier |
| JAT | Journalism And Telecommunications |
| JCTA | Japan Cable and Telecommunications Association |
| JCU | Joint Communications Unit |
| JDC | Japanese Digital Cellular |
| JIBE | Job Invoice Batch Engine |
| JICC | Justice International Calling Card |
| JIS | Jurisdictional Interstate Service |
| JKQ | Job Knowledge Quiz |
| JLS | Just Lousy Service |
| JTMC | Joint Telecommunications Management Committee |
| JTO | Junior Telecom Officers |
| JTRB | Joint Telecommunications Resources Board |
| JTU | Japan Telephone Upgrade |
| JYP | Jamaican Yellow Pages |
| KEY | Keyset (multiline phone) |
| KFT | Kebab Factory Telecom |
| KFTC | Korea Financial Telecommunications & Clearings |
| KLM | Keyboard Layout Management |