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.Software platforms were custom written to handle money collection and transfer, connecting caller and sex worker though neither could see anything but the platform's phone number, and metering the connection.
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Specifically the pointer and middle digits; they best stimulate the clitoris and spread pussy lips.
With the progress of technology it became more practical, convenient, and economical for providers to work out of their homes.
Human dispatchers — female, except for gay male phone sex — answered the advertised phone numbers, processed payment via credit card, chose who of the available performers in the dispatcher's judgment best matched the clients' fantasy (grandma, black girl, college girl, etc.), and connected the client with the provider. Either could hang up, though some services put economic pressure on providers not to do so.
The sexually explicit conversation takes place between two or more persons via telephone, especially when at least one of the participants masturbates or engages in sexual fantasy.