Sending DTMF tones over the uplink in-call
I'm working on a project that requires my app to be able to send DTMF tones on the voice's uplink frequency during an active call. My 2 conditions are: We don't use a customized Android platform We don't need to root the phone I've spent several days doing my homework and am aware that in-call DTMF sending is not supported by the current SDK/standard APIs. However, by using the relevant classes in com.android.internal.telephony I am hoping to mimic how the native Phone app does this. I followed this site on how to use internal APIs for standard 3rd party apps . I've also set myself up with the