The same thing happened to me. I assume it is an computer auto dialer that reacts to voice but nobody answers on the other line. I do hear a clicking sound. I have a home line but I answer it with a business name and not just hello. That may have something to do with it.
have received this call a couple times today... finally i waited and a voice said 'good bye'.
Gotta be a phishing scheme collecting our voice data for next gen hacking...lol
Have received a couple calls from this number in the last week - no one on the other line when I answer. When I call the number it says the "extension is not available, please leave a message." So I left one to remove me from their call list!!!