This article starts with color ring back tone

elaborating how to derive the conclusion that the original VAD algorithm must affect the CRBT sound quality by analyzing the theory and terms of this algorithm of the traditional GSM standard.Meanwhile

on the basis of it

proposing the innovative improvement for the GSM standard（intelligent algorithms） by which VAD algorithm can be used normally but not affect CRBT sound quality so that absolutely resolves the inevitable problems for the past years on the GSM network.