Android Call Screener App Build

I’m building a small utility that automatically picks up any call from an unknown number, speaks a short greeting, and asks the caller to say their name. If the caller responds, the app must immediately pass the call through so my phone rings normally and I can answer... (Budget: $250 - $750 USD, Jobs: Android, Android App Development, Android SDK, Android Studio, Asterisk PBX, Java, Kotlin, Mobile App Development)