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The method used by an escort booking agency to ensure maximum utilization of their resources. The objective is have the next customer available on site to ensure minimum down time, but at the same time ensure the previous customer has left and the girl has had a chance to clean up before her next "date".

The first call will provide general location information (such as the name of a hotel) while the second call (which occurs after arrival at the location) will provide more detailed information such as a room number.
After making an appointment with the agency, it was a standard two-call system to get to the girl's room.
by daed November 02, 2011
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