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
2009-10-25 16:25:07
Fax Machine
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.