Digit | Frequency 1 | Frequency 2 | Length --------+-------------+-------------+-------- 1 | 700 Hz | 900 Hz | 55 ms 2 | 700 Hz | 1100 Hz | 55 ms 3 | 900 Hz | 1100 Hz | 55 ms 4 | 700 Hz | 1300 Hz | 55 ms 5 | 900 Hz | 1300 Hz | 55 ms 6 | 1100 Hz | 1300 Hz | 55 ms 7 | 700 Hz | 1500 Hz | 55 ms 8 | 900 Hz | 1500 Hz | 55 ms 9 | 1100 Hz | 1500 Hz | 55 ms 0 | 1300 Hz | 1500 Hz | 55 ms Code 11 | 700 Hz | 1700 Hz | 55 ms Code 12 | 900 Hz | 1700 Hz | 55 ms KP1 | 1100 Hz | 1700 Hz | 100 ms KP2 | 1300 Hz | 1700 Hz | 100 ms ST | 1500 Hz | 1700 Hz | 55 ms