Sending DTMF tones over the uplink in-call

Question

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:

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Answer 1

Simply put, you won't be able to do it without customizing at least the Phone app, which has to run as a system user in order to access the modem. In order to do this, you have to root your phone.

To meet your requirements the only possible solution is to enhance the android platform. We did just that, and already sent in our patches to the AOSP project:

https://android-review.googlesource.com/32820

https://android-review.googlesource.com/32821

We are currently waiting for the Google developers to review and accept our contribution. If you are interested, please let Google know on the various AOSP lists (android-contrib, android-platform). It will hopefully expedite the review.

Best Regards, Gergely