Having a landline is starting to turning to be constantly harassed by cold callers these days.
So I’m thinking about making incoming calls landing on a voicemail controlled by a custom computer script where my phone would only ring after the audio captcha is successfully solved.
But of course, the problem is they are humans from low‑income countries most of the time, not bots. So since I’m expecting calls only from guys working in ɪᴛ, I thought of something they typically can’t afford : a fast cell phone since the applications they can use on their work computers are restricted.
In that case, I’m thinking about something like :
If this call is important, and in order to prove its aim is not commercial, please dial the last 5 digits of
[big random number]factorial followed by the # key.
So what kind of better captcha like challenge which can be solved over voicemail I should use ?
Rules : every generated text can be turned to speech and anything that can be programmed is possible, but the foreign low‑income worker from a company illegally spoofing the original phone number needs to be disrupted.