Wanted to know if there is a way to decode the DTMF signals (sent from other phones) into numbers so that the number can be manipulated as required?
For eg: If I am pressing 1234 from phone A during a call I should be able to get that 1234 number on the Android phone B.
As far as I know this is not supported yet.
You can't tap into the voice call sound stream, so there is no way you can detect DTMF tones by yourself even if you wanted to.