Android Call Input & Output Audio

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Apr 26, 2016, 2:01:41 PM via Website

where can i start in order to build an app that controls the conversation audio (mic & speaker) live on every call ?
so there is two questions actually..
1 is what api can i work with to control the call audio in and out
2 how can i make my app streak to the dialer or every call the phone makes


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