I just tried it with Betamax' Sparvoip and didn't have much luck. I heard the dialing tone but the connected phone never rang. From Truphone and Gizmo5 my Voxalot iNum works perfect. Thanks a lot!
I am also excited that even Peru has a local access number for iNum.What's now missing is: free calls from Skype to iNum. In this case I could forward all Skype calls to my number and could answer all calls on a normal phone. (No Voxeo developer hack necessar anmore).