Quote Originally Posted by Russell View Post

I had a tree down over the weekend and was at home yesterday making calls to tree contractors. And, they would call me back ... at least a couple of calls when I picked up the phone I would hear nothing. I'd hang up and a few minutes later the phone would ring again and this time all would be well. Does this follow any classic case (no audio / one way audio)? Thought I'd mention this in case this is related to the no-busy signal being discussed.
Do you have all the audio ports forwarded (35000-65000)? It sounds like maybe some port ranges aren't getting through to you and on the 2nd attempt when on a different port it is. If not, I'd recommend trying that to see if it clears this up for you.