example if only collect calls will effect a trigger then the threshold is applicable to only such calls as indicated in the figure the subscriber is permitted a total of ten calls to be completed within a one day period the record thus shows 34 10 34 for the threshold field 34 complete 34 for the block complete field and 34 daily 34 for the reset period field the particular designations are exemplary the initial threshold number can be set to any level and the reset period also can be other than a daily period as long as the threshold exceeds zero incoming calls will be routed for completion by application of the appropriate messaging by the iscp each time an incoming call is completed the cpr threshold number will be decremented by one if the threshold number has been decremented to zero no further triggered incoming calls will be routed for completion by the iscp the iscp may instruct an appropriate central office to transmit an explanatory message to the caller if the threshold has been exhausted the threshold may be reset automatically at the beginning of each day or reset in response to the first call received in a new day automatic resetting may be performed simultaneously for all subscribers having daily reset periods fig3 is a flow chart representing this operation the called subscriber 39 s directory number is received at step 102 from a direct dialer or through input obtained in an automated collect call the appropriate central office switch is set to respond to temporarily suspend the call step 104 and trigger a message.