SIP settings I found here:
here(in German !).
Because "connectionserver.smsdiscount.com" have too much characters for Voxalot, I replace it by the ip from betamaxserver 194.120.0.198. Usually unregistered, but yesterday I have try it in registered mode too.
Call out is working, VoxCallMe too so I think that repalacement not the problem. Only Voxalot callforward don't work. With SIP Discount same problem(but no credits there, only try-minutes).
(I see now I have my number in the From User and not username, cant that be a problem?)