What is DTMF? (Touch-tone / keypad tones)
2 min read · Bolcho
The beep tones a phone sends when you press keys — used for menu selection, OTP entry, and secure input during a call.
DTMF explained
DTMF (dual-tone multi-frequency) is how keypad presses travel over a call. Voice agents use it for things you shouldn't say aloud, like entering a card number or OTP, and for legacy menu navigation.
Why it matters for voice AI in India
Understanding dtmf helps you build voice agents that actually work for Indian callers, genuine languages, low latency, and near-cost pricing. Bolcho is built around exactly these fundamentals.
See it in a real agent
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Frequently asked questions
What does DTMF mean?
The beep tones a phone sends when you press keys — used for menu selection, OTP entry, and secure input during a call.
Why does dtmf matter in voice AI?
DTMF (dual-tone multi-frequency) is how keypad presses travel over a call. Voice agents use it for things you shouldn't say aloud, like entering a card number or OTP, and for legacy menu navigation.