> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.uponai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Capture DTMF Input from User

> Let callers enter information via phone keypad presses instead of voice.

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.
```

## DTMF Input Completion Options

Configure when the agent considers DTMF input complete. These options are under **Call Settings**:

| Option          | API field                           | Description                                                                              |
| --------------- | ----------------------------------- | ---------------------------------------------------------------------------------------- |
| Digit Limit     | `user_dtmf_options.digit_limit`     | Maximum digits the user can enter. Input completes when limit is reached.                |
| Termination Key | `user_dtmf_options.termination_key` | A key (`#`, `*`, or any digit) that signals end of input.                                |
| Timeout         | `user_dtmf_options.timeout_ms`      | Milliseconds to wait after the last digit before timing out. Resets with each new digit. |