A separate question about the intended functionality: The assistant needs to receive the remote caller’s speech during a cellular call, transcribe the conversation inside the app, and notify the user when a potentially urgent request is detected. Is there any supported public API that gives a third-party iOS app access to the remote caller’s audio during a native cellular call, with the appropriate user consent? We understand that microphone injection adds synthesized speech to the call and does not itself provide access to incoming call audio. If this is unsupported, does implementing this functionality require calls to be handled by our own VoIP service or a carrier-side integration?

Additional information: the iPhone 16 Pro is running iOS 26.6.2.