31 Oct
2018
31 Oct
'18
10:49 p.m.
Hi Chandramouli, This is DTMF association to symbols: 569 * 570 * Tones: 571 * 1209 Hz | 1336 Hz | 1477 Hz | 1633 Hz 572 * 697 Hz '1' '2' '3' 'A' 573 * 770 Hz '4' '5' '6' 'B' 574 * 852 Hz '7' '8' '9' 'C' 575 * 941 Hz '*' '0' '#' 'D' If the device has different keypad from above then you need to find out which key it has mapped to DTMF comprised from 697 Hz/1633 Hz frequencies. cheers, Piotr