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Why does the phone make that little poot sound when a spam caller connects?

Asked by Jeruba (55828points) July 19th, 2018

Why any sound, and why that particular sound?

Or doesn’t that happen for everyone?

When I answer, first there’s silence, and then that sound. Sort of like an electronic pop, but sticky, as if popping through syrup. The caller does not seem to have heard me answer.

What is going on, what kind of signal, between the caller’s place and mine to produce that sound? It doesn’t happen when real people call me.

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