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Sometimes callers prefer to provide information via DTMF (phone keypad presses) rather than speaking — for example, when entering a PIN in a public place. DTMF input from users is captured and included in the agent’s context by default. To use it, simply prompt the agent to ask for the information via keypad. Example prompt: 
Please enter your PIN number using the keypad. You can finish by pressing the pound key.

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DTMF Input Completion Options

Configure when the agent considers DTMF input complete. These options are under Call Settings:
OptionAPI fieldDescription
Digit Limituser_dtmf_options.digit_limitMaximum digits the user can enter. Input completes when limit is reached.
Termination Keyuser_dtmf_options.termination_keyA key (#, *, or any digit) that signals end of input.
Timeoutuser_dtmf_options.timeout_msMilliseconds to wait after the last digit before timing out. Resets with each new digit.