Busy line issue
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It took me understand some time to understand why I am not able to call some people, firstly i was rebooting the phone that has solved it sometimes (because the other side stopped their call) then i realised "A: hey i am sorry i was not able to call you, my phone must be broken B: no I had a very long call with family member").
There seems to be an issue when I am calling to anybody that is busy (in call with someone), the call is ended immediately without letting me know that "line is busy" either with beep beep or with the text.
20.04 OTA-5 rc Miatoll