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noBody𓅦🧱 | 2 months ago (raw) | root | parent | reply | flag +2 
 Such a weird sound but same. I wonder what the story is behind it… or maybe some dude just randomly decided to make it that way 🤔
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FarmerTbone | 2 months ago (raw) | root | parent | reply | flag +1 
 It was literally an audible translation of 1s and 0s.
Traditional phonelines were only able to transmit noise - this was the solution for transmitting data.
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noBody𓅦🧱 | 2 months ago (raw) | root | parent | reply | flag 
 I think this corroborates your explanation. Regardless, i found it entertaining 😂

https://youtu.be/GCe6xnxdN1Y
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FarmerTbone | 2 months ago (raw) | root | parent | reply | flag 
 Great little animation. 
Yes, by default, the speaker was active during the handshake for the user to confirm that all was well.