It’s meant to give the illusion you are speaking to a real person. the idea is that when talking to a real person working on a computer you can hear them typing when confirming or looking things up. Thus when the computer needs to think it plays that same sound. Its a psychological trick mean to make you feel more at ease but also think the computer is actually working and you aren’t wasting your time.
It’s a “spinning circle gif” for your ears — people are accustomed to hearing someone on the other end of the phone typing while not speaking, so they wait for a response. It’s for a “there will be a short wait”, versus being “put on hold” which means “I have to wait a while”.
It’s a trick to make you keep listening, or make sure you don’t think you’ve been disconnected.
I may be misunderstanding the question, but in the case of an automated phone interface, these are likely just touch tones issued by the computer to redirect your call based on your responses. if you were to respond by pressing a key, that same tone would be issued by you instead. the touch tone interface replaced the rotary interface (using a number of timed pulses) with audible tones for the standard 12-button phone interface.
if you are talking about a clicking noise that sounds like typing on a keyboard, then it may be what the other answers are indicating as aesthetic noise.
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