(a) Except for the defined telecommunication services in subsection (c) of this section, the sale of telecommunication service sold on a call-by-call basis shall be sourced to: (1) Each level of taxing jurisdiction where the call originates and terminates in that jurisdiction; or (2) each level of taxing jurisdiction where the call either originates or terminates and in which the service address is also located.
(b) Except for the defined telecommunication services in subsection (c) of this section, a sale of telecommunication service sold on a basis other than a call-by-call basis is sourced to the customer's place of primary use.
(c) The sale of the following telecommunication services shall be sourced to each level of taxing jurisdiction as follows:
(1) A sale of mobile telecommunication service, other than air-to-ground radiotelephone service and prepaid calling service, is sourced to the customer's place of primary use, as required by the Mobile Telecommunications Sourcing Act.