1. In a telecommunication system, an apparatus for selectively controlling a telephone call, comprising: means for determining if a call gapping control is active for the present telephone call: means responsive to said determining means for obtaining level of service information which is associated with an ANI of the present telephone call if said call gapping control is active; and means for applying said call gapping control to either allow the telephone call to be completed or terminate the telephone call based on the level of service if said call gapping control is active for the present telephone call; wherein the probability of completing the call while said call gapping control is active increases as the level of service of the call increases.