Is it possible to create a app that makes phone calls and play sounds when phone call begins and ends?

Question

I want to do following task:

1. While on a conversation with a friend, (ie when call is received) play a sound from my phone so the other person on the other p

Answer 1

Unfortunately, no, you can't. Apple doesn't allow you to do anything related to phone calls, other than start a call. The only way is if you do some kind of over-the-internet call, like a skype phone. But that won't be like a normal phone call.