CCITT Rec. E.850 (10/92) CONNECTION RETAINABILITY OBJECTIVE FOR THE INTERNATIONAL TELEPHONE SERVICE FOREWORD Introduction 1 Definitions 2 A measure to quantify telephone connection retainability performance 3 Overall objective for premature release probability 4 Allocation of the overall objective ANNEX A - Relationship between the premature release probability and its estimator ANNEX B - A method to estimate the premature release probability for an international telephone connection Bibliography