Pretty much any vhf/uhf ham rig with a dtmf mic. will also decode dtmf if it's able to transmit it,as it's needed to do this for irlp or repeater control functions. Is this what you were asking?
N9ZAS.
Let's first find out from the original poster what their intended use of this function is. If it's to decode a set unit or group ID code, then your answer fits. If it's to decode over the air repeater control codes or phone numbers being sent to an autopatch, then it needs to be an open ended DTMF reader that is external to the radio like the one that Ramsey Electronics sold.