No.
12voip is not SIP compliant. Neither Justvoip (although you can register to it).
And to call free with 12voip you have to add the other party as one of your contact. So...no way till now to use ATA/Voxalot.
To the majority of the countries landlines voipbusterpro is still the best option with SIP compliance. But check also other betamax/thirdpaties.
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