Voice Service Providers (VSP) registration is only permitted to premium users (paid subscription). Also, not all VSP can work with Voxalot. What happens is that many VSP don't like when people have the choice to call through them or through others as simple as dialling in a different way (using Voxalot's dial plan feature). So they block or degrade the service if you are using Voxalot.
If you plan to use Voxalot with VSP providers as a premium user look first for information from other users about the way those providers works with Voxalot. With some it's impossible to register at Voxalot as VSP. With others (such as betamax products known as VoIPBuster and similar), they register but you will see something that is not so good as using those services directly: betamax FUP, greater jitter because they don't admit SIP re-invite, and so on.
Regards,
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