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Interactive voice response is a technology that allows a computer to interact with humans through the use of voice and DTMF tones input via a keypad.
IVR systems are an example of computer-telephone integration (CTI). The most common way for a phone to communicate with a computer is through the tones generated by each key on the telephone keypad. These are known as dual-tone multi-frequency (DTMF) signals.
Example of Toll Free No. 1800 1800 1234