Inbound calls work but can't make any phone calls regardless of what number.

Called Slingshot tech support and was told everything is ok, but tried on three different devices that used to work (PC Xlite/Router integrated ATA/Obitalk 110) all the same problem.

I noticed my italk password has recently changed (it's a system generated one and was told it shouldn't change) not sure whether that's related, I have updated all my settings with the new password though.