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

You can't send DTMF tones during an active call, but you can send them when you "program" them when you initiate the call. see the following post: https://stackoverflow.com/a/12986066/475472