Base question: Suppose a telemarketer in State T calls a consumer who is a resident of, has a phone number associated with, and is physically present in, State C. In addition to federal law applying, which state's telemarketing laws apply?
Twist 1: What if the caller's location (State T) is unknown?
Twist 2: What if the consumer's physical/resident location is unknown? That is, for this twist, suppose the consumer is not actually in State C when called, but still has a phone number from there. (Assume State C remains identifiable by the consumer's phone number).
Twist 3: What if the product being sold is partially or completely geographically tied to State P, such that the consumer would have to travel to P to use any purchase?
Bonus points for case or law citations.