Hang-ups on all outgoing calls

I’ve been using Ooma office for a couple of years with no problems.

Starting Tuesday, every time I try to make an outgoing call, it automatically hangs up on me and gives me a new dial tone. And around and around I go.

Is this a know problem at Ooma’s end? Or more likely a problem with my device, or with my internet connection?

By the way, incoming calls are working properly – the problem is just outgoing calls.

I swapped in an older phone and I’m able to make outgoing calls again – so it looks like this was just an equipment problem at my end!