It's good to be able to use voipbuster as "one of the many" providers within Voxalot.
It's also important as you don't have to stick to "just one provider" when using an ATA with just one FXS.
Last but not least you set dialplans with Voxalot, and then dial "as if it was a local call". For example, dialing Punta del Este, Uruguay, from Montevideo, Uruguay (it's a real life example), it's way cheaper through voipbuster than through PSTN. Therefore I just set up a dialplan allowing to dial 042-xxxxxx (as it would be dialed over PSTN) instead of having to dial the whole 0059842-xxxxxx, and tell the plan to go via Voipbuster. I am sure you'll find appropriate examples in your local calling.
-Santiago
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