Question Play a recording at the begining of each call

Hello all!

I have a rooted Samsung Galaxy S3 on the Metro PCS network. I have installed the Xposed framework and the "Enable call recording" module. At first it was for personal reasons, so I can keep track of orders my boss gives me, etc, but I was recently threatened and for legal reasons in order to comply with the laws where I live, I would like an automatic recording to play at the beginning of each call informing all parties on the line of my intent to record the conversation.

Are there any existing solutions or is this something I would have to program myself? How difficult would it be? I studied Java a bit in college but I've never done anything with Droid.

I am a PHP developer, haven't touched any Java since college so please keep it simple for me.