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TelephonyDtmf(value)DTMF <https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling>__
digit in Telephony Gateway.
Values: TELEPHONY_DTMF_UNSPECIFIED (0): Not specified. This value may be used to indicate an absent digit. DTMF_ONE (1): Number: '1'. DTMF_TWO (2): Number: '2'. DTMF_THREE (3): Number: '3'. DTMF_FOUR (4): Number: '4'. DTMF_FIVE (5): Number: '5'. DTMF_SIX (6): Number: '6'. DTMF_SEVEN (7): Number: '7'. DTMF_EIGHT (8): Number: '8'. DTMF_NINE (9): Number: '9'. DTMF_ZERO (10): Number: '0'. DTMF_A (11): Letter: 'A'. DTMF_B (12): Letter: 'B'. DTMF_C (13): Letter: 'C'. DTMF_D (14): Letter: 'D'. DTMF_STAR (15): Asterisk/star: '*'. DTMF_POUND (16): Pound/diamond/hash/square/gate/octothorpe: '#'.