when someone is on normal call and i call from whatsapp, why does it say that the person is busy

When Someone is on Normal Call and i Call from Whatsapp, Why Does it Say That the Person is Busy?

avoid being disconnected on whatsapp call when someone calls your mobile

How to Avoid Being Disconnected on Whatsapp Call When Someone Calls Your Mobile

long do you have to cancel whatsapp call before it shows up as missed call to other person

How Long Do You Have to Cancel Whatsapp Call Before it Shows Up as Missed Call To Other Person?