Even if you don’t use Skyetel, they have some info on taxes that might be helpful for you or point you in some directions and fill up some knowledge gaps.

https://support.skyetel.com/hc/en-us/articles/360051660293-Taxes-and-Regulatory-Fees

https://support.skyetel.com/hc/en-us/articles/360047843714-FCC-Registration-and-USF-charges

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Also search “tax” in their KB search bar.

What jurisdiction(s) are you selling VOIP in?

Also a bit unrelated - which vendor did you go with for the STIR SHAKEN solution?

Whatever you do, if you decide to go with CSI (Compliance Solutions), vet the hell out of them. They used to do taxes for SkySwitch and that white label provider got hit with FCC fines to the tune of almost $2M for violations.