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I need a custom app designed for both Android and iPhone. iPhone version should also be scalable for use on iPad with VOIP app (like Talkatone) installed. Android version should also be scalable for use on Android tablets with VOIP app (like GrooveIP)
App must launch when an incoming phone call is detected from a specified telephone number. There will only be one incoming phone number that launches the app. Calls from any other number will be ignored by the app.
When incoming call is detected from specified telephone number, it will launch an expandable overlay to the native phone app (similar to the Android app "Current Caller ID". The overlay will display a designated line of text, as well as a small image in the upper left corner. .
Once the call is answered, the overlay should expand automatically to full screen. The expanded area will include an iframed/embedded video feed, as well as two control buttons. One button will end the call and close the app window, and a second button will be configured to send a specified DTMF (touch tone code).
The app should also have some logging features, such as logging the date/time of each incoming call from the specified number.