Title: What is a DTMF Code?

URL: https://www.infobip.com/glossary/dtmf-code

DTMF Code, short for dual-tone multi-frequency code, is a response code generated when an end-user presses the numbers on a mobile or landline phone’s keypad.

Each number from 0 to 9 is uniquely identified with a DTMF code that can be received and interpreted on the receiver side. DTMF code signaling enables reception of information from the end user e.g. PIN codes during a voice call.

## How are DTMF codes used in the telecom industry? 

Today's mobile telephones use a digital process for standard calling and messaging, so DTMF codes are not used when connecting to the mobile network base station. However, they do support DTMF codes for a number of important use cases:

- Entering pin codes as part of [2FA](/blog/what-is-2fa-everything-you-need-to-know) or [3FA](/glossary/3-factor-authentication) authentication solutions
- Entering credit card details over the phone
- Navigating automated telephone menu systems
- Integrations with older telephone systems

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