Who called from 6783175200

receiving calls about every 5 mins now.  no one on the other end except a beeping sound, like perhaps a fax

Calls every 3-5 mins, msg ended up being a fax machine beep sound.

Fax type beeping, getting called every few minutes

Sounds like a fax machine.  If you call it back, it's Traveler's Insurance.

Keep getting beeping calls every few minutes - this is a business.  This MUST stop.!!