On Wed, 14 Oct 2020, Nuno Vieira via NANOG wrote:
So... my question IS: Is an European company (or whatsoever foreign wholesale company) WITHOUT ANY customers in USA liable to pay those taxes to the carrier ?
Those aren't customer taxes, they are company surcharges with names to discourage customers from complaining about them. They are like "resort fees" hotels add on top of room rates or "fuel surcharge" added by package delivery companies. Commonly called "junk fees" even if many companies add the same fees. You'll need to speak with your corporate lawyer how to negotate contracts and billing arrangements. Depending on your negotiating power, you may or may not be successfull. As you've noticed different companies make business decisions to have different surchages, which indicates they aren't determined by a common government entity. Another way you can tell they aren't real taxes, carriers charge government agencies the same surcharges even though government agencies are tax-exempt.