While Ron is correct, if you have a good provider that does it well and you trust them, then it makes sense to go with them. So personally I call toll-free through my Gizmo Project account, but if they started charging again or quality suffered, I too would reconsider Voipmich or FWD for placing my calls.
The way to corrupt them is to add something like 0123 before the ENUM replacement value, so the lookup can't find any record in ENUM.
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