I require an application that once installed will present a new button on the dialer screen once you are on a call, and if pushed will play a sound that the other side of the caller will hear aswell.
1) Once you have a connected call new button will be there
2) once you push call it will play a sound to the other side of the caller
3) very basic menu option: enable/disable, and a option to select different sounds
Please advise if this can be achieved without root access. or if root access is required. Also advise other projects you have worked on, and how you intend to achieve the requirements