android - Want to get users input during call -

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i want achieve following in android.

when usera make call userb. when userb press key during call on number pad usera can notification users selected button.

is possible?

by using gsm call feature want doesn't have api support. can try of following

case 1:

when number key pressed during call dtmf tone send. try if can somehow decode dtmf tone. there no recording option in android during call can try setting speakerphone on.. ( haven't tried this, not sure fully) can see project

case 2

create channel on network. create server client mechanism register each number in server. whenever 2 calls of 2 registered users made send data on network. can see similar apps thruto


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