There seem to be some issues with use of Betamax brands with Voxalot and the moment, which you can read about on other threads, but as a precis:
Betamax calls don't seem to work using the eu.voxalot server, but have been ok so far with us.voxalot
Although Voxalot are sending the same header/IP info to Betamax, it seems like Betamax have introduced a restriction, whether deliberately or inadvertently nobody knows yet
Try swapping to the us server, and have you tried other VoIP providers with Voxalot's mobile callback?
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