I don't think the problem is strickly CBW, since I also have the problem with VOIPBuster (which has worked in the past). The paranoid in me wonders if the recent "merger" of Riiing and UM has anything to do with this. I will email Barry, though.
I tried triggering a call with the internet (with no luck). I've also tried triggering the calll with VOIPBuster also without any luck. (I can't use the Swiss SIM because I only have one phone
)
I did give out the toll free number but also the Riiing number so I should be OK.