I too am getting fax-like calls from this. Just beep beep beep on the other end. I'll try the timeout fix if it keeps happening.
on my call block list
started getting calls Saturday at noon, 5 times, seems like a fax machine. answered first, blocked 2nd, 3rd, 4th. on 5th try, I answered again and let the machine timeout or whatever. That seemed to do the trick in getting it to stop auto-redialing.