I am in need of building call recording application. I can handle incoming/outgoing phone call event now. But there is no solution found to access to phone call audio stream.
Referenced How can I record a conversation / phone call on iOS?, but working on only jailbreaken.
How to access phone call audio stream and record it?
Apple does not currently allow it: it is not possible to spy on conversations on a non-jailbroken iPhone, even with potential user consent.