DTMF Tone Generator Applet
(Java 1.1 Version)
The applet generates DTMF (Dual Tone Multi-Frequency) tones as used on TouchTone phones. The number can be dialled by clicking the appropriate buttons on the keypad or pressing the keys 0 - 9, *, # etc on your keyboard. Alternatively, click in the text field and type in the phone number, then click "Dial". If you hold a TouchTone phone close to the speaker, the tones should register as if you dialled them on the phone keypad.
Note that the applet works much more effectively if you have a sound card. If you don't, you just have to hum the tones yourself.
The keys A, B, C and D shown on the keypad generate tones in accordance with the TouchTone standard. These keys are not normally found on telephone keypads at present, but may be used in the future.