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hi, i am trying to get the 2cabel's from the DTMF speaker to change the message forward on the LCD when pressing the keypad. all that without distorting the sound...
is it possible?
anyone have an idea?
As i come to know your problem that, When your telephone connection is established you need to work with DTMF so that parallely you want SMS setup.
If it so, You need to do little bit modification on your telephone itself.
1) You do a relay circuit,When connection is made, the relay is activated such a way DTMF circuit output connected to receiver part of your telephone should be disconnected.
2) As connection is closed( conversation is over) you can deactivate relay such a way that DTMF circuit connected to receiver part of your phone.