Ios 15.3.1 problem

Hello dear kindly I need your support about this problem since I update my iOS 15.3.1 every time I have a call and get waiting I can’t close this sound beep beep beep beep beep only solution to end this sound press on lock bottom so both of call will end or I can reject and answer second call or I can reject only or I can answer and hold So please I need solution for this problem