Works for me -> Exactly as you specified your softphone info and the sphone.vopr.vonage.net. 5061 and register. Exactly.
One other piece of advice would be to make sure you don't already have a softphone registered with 5061 & vonage. I had this issue when trying to register my second sipphone line. Once I got out of all software running elsewhere - then toggled the register to no - save then right back to yes and save -- after about 20 minutes it registered thru voxalot. Found after, I started my softphone and everything works.
Good luck.
Voxalot is the best solution so far for me.
