Indiana Code Title 6. Taxation § 6-2.5-12-4

Sec. 4. As used in this chapter, “customer” means the person or entity that contracts with the seller of telecommunications services.  If the end user of telecommunications services is not the contracting party, the end user of the telecommunications service is the customer of the telecommunication service, but this sentence only applies for the purpose of sourcing sales of telecommunications services under this chapter.  The term does not include a reseller of telecommunications service or for mobile telecommunications service of a serving carrier under an agreement to serve the customer outside the home service provider's licensed service area.