How does customer care system detects the key number which we press while calling?

Source- Google

 The technology that works behind this framework is called IVR (INTERACTIVE VOICE RESPONSE). Intelligent voice reaction (IVR) is an innovation that permits people to cooperate with a PC worked telephone framework using voice and DTMF(Dual-tone multi-recurrence flagging) tones input through a keypad.

 In broadcast communications, IVR permits clients to cooperate with an organization's host framework by means of a phone keypad or by discourse acknowledgment, after which administrations can be asked about through the IVR exchange. IVR frameworks can react with pre-recorded or powerfully produced sound to additional immediate clients on the most proficient method to continue. IVR frameworks sent in the organization are estimated to deal with huge call volumes and furthermore utilized for outbound calling as IVR frameworks are more insightful than numerous prescient dialer frameworks.

Source- Google

Dual tone multi-recurrence flagging (DTMF) is a media transmission flagging framework utilizing the voice-recurrence band over phone lines between phone gear and different specialized gadgets and exchanging focuses.

Generally when we call to customer care, Firstly we Interact with the system which provides you some menu and asks you to press a particular key for choosing the option (press 1 for english), so when we press the key that key produces some sound. Each key produces different sounds of different frequencies, and this frequency is sent to the reciever side (System of customer care)

Source- Google

Latter on this friequency is decoded and framework distinguishes the privilege squeezed key. 

That is the reason here and there on the off chance that we need to enter any long line of number, we type it rapidly and henceforth the framework neglect to distinguish it or unravel it.

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-Aman Patel