Electronic Engineering Association, United Kingdom
| Tone Number | Code Digit | Frequency |
| Tone 0 | 0 | 1981 Hz |
| Tone 1 | 1 | 1124 Hz |
| Tone 2 | 2 | 1197 Hz |
| Tone 3 | 3 | 1275 Hz |
| Tone 4 | 4 | 1358 Hz |
| Tone 5 | 5 | 1446 Hz |
| Tone 6 | 6 | 1540 Hz |
| Tone 7 | 7 | 1640 Hz |
| Tone 8 | 8 | 1747 Hz |
| Tone 9 | 9 | 1860 Hz |
| Repeat Tone | 2110 Hz | |
| Group Tone | 1055 Hz | |
| Alarm Tone | 2400 Hz | |
| Sequence Length | 200 msec. | |