Using Zoiper Lite 3.21 on iPhone with iOS 12.1.3
when I set the phone to silent with the hardware switch and there is an incoming call, the phone vibrates, which is correct. But if I reject the call by tapping the (X) icon, the screen goes back to Zoiper main screen but is also starts to play the ringtone (the default one, I have not changed it) for a second or two. This is wrong, it should not play the ringtone, especially not after I already rejected the call.