DTMF (Dual-Tone Multi-Frequency)
Capture user input through phone keypad presses for secure and discreet interactions.
Created: April 24, 2025
Overview
DTMF (Dual-Tone Multi-Frequency) allows callers to provide input using their phone keypad during a call. This input is captured in real time and made available to the AI agent for decision-making and workflow execution.
This mechanism is especially useful for structured or sensitive inputs that should not be spoken aloud.
Description
VINSI.AI’s DTMF feature enables agents to collect numeric input such as PINs, menu selections, or confirmation codes directly from the caller’s keypad.
DTMF input is automatically captured and considered in agent responses by default, without requiring additional configuration.
Usage
- Ideal for entering PIN numbers or verification codes
- Useful in public environments where speaking is inconvenient
- Commonly used in menu-based or IVR-style interactions
Compared to spoken input, DTMF provides higher reliability for numeric data and reduces the risk of transcription errors.
Implementation
To use DTMF input, instruct the agent to prompt the caller to enter digits using their phone keypad.
- The agent should explicitly request DTMF input
- Callers must verbally indicate when they have finished entering digits
- Captured input is immediately available to the agent
Technical Features
- Agents can send DTMF tones programmatically using the
digit to pressparameter - Supported through the Call API (see API documentation under Tools)
- DTMF events are handled natively by the platform
Example Prompt
Press 1 for appointments.
Press 2 for more information.
Press 3 to speak with a representative.