@GenixPRO Thank you for your interest in ACS and iOS compatibility regarding CallKit inclusion.
Can you please verify if you are using the Azure Communication Calling iOS SDK?
Please note that version and later have included CallKit as part of a preview experience. Those release notes can be found here. If you are using the iOS SDK, then yes, CallKit would be included there.
If you are not using the ACS iOS SDK, please let us know so we can investigate if further parts of ACS have the CallKit functionality elsewhere.