| Clue | Source | Date |
|---|---|---|
| Tech that uses Wi-Fi to make phone calls | Universal | 27 Dec 2025 |
| Voice Over Internet Protocol | ||
| Telephone-on-the-web tech | LA Times Daily | 27 Mar 2023 |
| Telephone-on-the-web technology | ||
| Telephone conversations on the web technology, for short | ||
| Transmission technology used in Skype |