I saw this problem yet again yesterday on 2 different calls. This time I had the problem on incoming calls like the OP. I've also been having problems with out going calls where it never rings. Usually redialing the number will get the call to go through. My problems always crop up at the same time each month. I'll go 3 weeks without a problem then just like clockwork here come the problems again. Nothing changes on my end. Has to be something on VOIPo's end. But they will tell you it isn't.