How to hear music while end phone call in IOS

I want to do the following task:

Make a call to someone after they pick up the phone, the application play a sound from my phone after it finished the application will close the call.

Is it possible or not in iOS ? I need some help.

Thank for any help.

Solution

When user receives call, speaker and audio hardwares are grabbed by OS from apps using them and suspend those apps. So, it's not possible to get audio hardware from OS while user has stablished call connection.