Eh, if you avoid Level 3 and Bandwidth.com directly, and go to a wholesaler like Endstream, you won't need any volume. Just throw $20 in your account every few months and you should be good.
> But, the current plan is to charge the businesses that want to receive calls from their international customers for tracking and control.
Mmm, you could totes do this, make sure to use Opus and pitch it as Full HD Audio (better than that tin can HD that carriers are pushing now). Grandstream supports Opus straight to their deskphones by the way, so you may wanna look at them. Their middling quality, but rock bottom price wise.
> branded links that auto-dial their number ... track the source of the caller
How do you plan to get the caller's name?
Also, travel businesses might be a viable model for this, I'd just encourage you to think outside the box, what other areas could use this kind of service?