A couple of days ago the Canadian access numbers for
DialNow | Cheap International Calls were down.
I contacted Betamax via their ticketing system in the account page, and they corrected it by the next moring. Since the dialnow service is meant to be used via access numbrs and not hosted, it is obvious that the Betamax server had some issues. There is a possibility that the other SIP services use some of the same servers.