[Freeswitch-users] DTMF Issue - Unexpected digits are receiving

[Piotr Gregor]

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
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