I came up with a way that might solve this problem. At first, setup an App group for the host app and CallDirectoryExtention, The host app sets the flag to UserDefault when a specific value is obtained and reloads the CallDirectoryExtention, so that the CallDirectoryHandler can refarence at the flag in UserDefault and if the flag is the specific value, run removeAllIdentificationEntries() only. I think that with above method, it is possible to only delete the CallDirectoryExtention entries when a specific value is obtained in the host app, is this wrong?