It has nothing to do with webloopbacks, I am calling from my hotel using Xlite configured to voxalot, the dial plan uses voipcheap for this number then I am dialing my vbuzzer number that is already registered to sipbroker to forward to
myvbuzzername@vbuzzer.com:80
The call does not go through it says the number does not exist. However if I take the software used by voipcheap and direct directly from this software it works. So there is definitely something wrong with SIP broker mapping