You hear the call ringing: when someone is called into a circle, the caller now hears it ringing too, so you know the call is going through.
Headphones just work: a connected headset takes the call instead of the loudspeaker, and hands it back when you take it off.
Wird now warns you if a phone setting would stop a call ringing, and opens the right screen to fix it.
Plus fixes for calls that connected with no sound.