I'd love to have JustVoip SIP compatible because Brazil is free in it and it is not common to have Brazil in free lists anywhere. (And yes: I use worldwide VoIP providers to call local landlines because this is much cheaper than local PSTN rates down here.)
Right now I'm using VoipBusterPro to call landlines, which is also from Betamax, is SIP compatible and has very good rates to Brazil and lots of other countries. I suggest all of you to take a look at.
Just mentioning, for mobiles I use Vyke, which also is SIP compatible and have very good mobile rates and quality.
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