I have an app in Obj-C that makes calls, I would like to play a sound when the user presses a button to start a call. Will the sound keep playing in the background when the call is made? If so, how can I achieve this?
Thank you in advanced
There is absolutely no way to play a sound while a Carrier phone call is in progress.
Sometimes, currently playing audio is interrupted by audio from a different app. On iPhone, for example, an incoming phone call interrupts the current app’s audio for the duration of the call. In a multitasking environment, the frequency of such audio interruptions can be high.
It is the same behavior with outgoing phone call. It will interrupts the current app's audio (playing/recording) during the duration of the call.
You can read more here : iOS Human Interface Guide