Known issue.

https://www.reddit.com/r/samsung/comments/18076bk/s22_ultra_on_att_updated_to_one_ui_6_now_phone/

Also in the Samsung forums.

My wife and I are having the same issue. We have an S22. Can’t answer or end calls, but the calls are coming through. My phone rings but it says the phone app is crashing every time a call comes in.

Try clearing your phone apps cache and data in Settings>apps. Call history and contacts won’t be deleted.

This update is the worst, having issues with bluetooth, my banking apps, calls, etc.

It’s an issue with the Phone app after the update. Download Google Phone and use that until a patch comes out.

man, that update is causing some serious phone call issues. hope samsung gets on this quick.

So glad I found this… I couldn’t connect for 4 days unless on wifi