The DTMF Decode block allows digits to be decoded from any audio input. The input signal could originate from a telephone or VoIP receive block, or from any analog or digital input.
The Component Object has 17 logic output nodes, 16 for all the possible DTMF digits (0-9, *, #, A, B, C, D) and one additional output, Any, which is the logical OR of all the other nodes. That is, if any valid DTMF digit is received, the corresponding output node and the Any node will trigger.
More information on logic is located here: DTMF_Decode_
Enable Logic turns the logic output nodes on the block on and off. Decoded Data shows the last few decoded digits. Clear removes any digits from this display.