N.H. Rev. Stat. Ann. § 82-A:4-d

A tax is imposed on intrastate and interstate communications services that are VoIP services provided by a retailer to a person with a place of primary use in this state, regardless of where the VoIP services originate, terminate, or pass through. The tax shall be imposed on the gross charge at the rate specified in RSA 82-A:3 and RSA 82-A:4. No tax shall be imposed on a person whose place of primary use is outside this state.