The possible DTMF tones.
DTMF tone used when pressing the 0 key.
DTMF tone used when pressing the 1 key.
DTMF tone used when pressing the 2 key.
DTMF tone used when pressing the 3 key.
DTMF tone used when pressing the 4 key.
DTMF tone used when pressing the 5 key.
DTMF tone used when pressing the 6 key.
DTMF tone used when pressing the 7 key.
DTMF tone used when pressing the 8 key.
DTMF tone used when pressing the 9 key.
DTMF tone used when pressing the pound (#) key.
#
DTMF tone used when pressing the star (*) key.
*