Comment on How to (actually) send DTMF on Android without being the default call appComments−1970-01-011yThis does the job just as well: https://play.google.com/store/apps/details?id=com.arcoirisla...−kelnos1yThat app doesn't allow you to inject the tones into an in-progress call; it just plays the tone. If the phone is in speakerphone mode it might work, though would probably still be unreliable. If not, then it just won't work.−ajb1yYeah, the echo canceller is going to try to make that not work, and DTMF tones are simple enough that it will likely succeed.
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This does the job just as well: https://play.google.com/store/apps/details?id=com.arcoirisla...
That app doesn't allow you to inject the tones into an in-progress call; it just plays the tone. If the phone is in speakerphone mode it might work, though would probably still be unreliable. If not, then it just won't work.
Yeah, the echo canceller is going to try to make that not work, and DTMF tones are simple enough that it will likely succeed.