What is this solid tone it goes to after the ringback?
Yeah I came across these on a number of calls as well, I thought they had something to do with supervision. I will try to get a landline (Unfortunately I'm really out in the sticks), It's such a shame to record these on VOIP.
MetallicClank.wav - This is the sound amplified.
This was after calling a valid number that supes usually, weird things happen sometimes just calling the same number.