On an app to app call with using SinchCallKit demo app that is provided in the latest version (3.12), if the caller hangs up an ongoing call by calling [SINCall hangup] before the callee answers, the CallKit UI won't be removed from the callee's lock screen. It stays there forever.
So my question is here that how can we remove the CallKit lock screen UI from the callee's screen automatically. Is this is a server side issue or Apple handles this via push notifications?
It is a bug in the Sinch SDK and it has been fixed since 3.12.1, please update to the latest version and give it a try.