Sex chat fantasy
The provider provided (say) 10 minutes of service, but got to keep all of the money (say 20 minutes).
When the Internet got relatively mature, sale of any sexual service not involving a minor could be made to anyone not a minor.
This is the world portrayed in Spike Lee's movie about phone sex, Girl 6.
At that time independent phone sex was more dangerous, as Lee's movie portrays.
The incentives for providers were then reversed; rather than earning money from keeping the customer on the line (orgasm delayed), they earned more from bringing the caller to orgasm quickly, so as to move on rapidly to another call.
Unused minutes were rarely usable on a second call.
Details vary significantly from one platform to another, but the provider may be given a personal page on the platform to use however she (sometimes he) wishes.Leonard recorded her own voice informing callers of the contents of the next issue of High Society magazine before its publication.Later she recorded others such as Annie Sprinkle "talking sexy".Originally phone sex services consisted of a managed network of dispatchers (live or automated) and erotic performers.Performers would come to a studio where they received a cubicle, coaching, and cash incentives to keep callers on the line longer.