Design Caller ID using DTMF decoder MT8870

  
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It`s very simple circuit using DTMF decoder MT8870 (or CM8870). As shown in the circuit, u`ll receive an interrupt ( if NAND output is connected to INT of the microcontroller) whenever u receive a call or make a call and then u can use yr program to read the digits coming out of pin 11 to 14 of the MT8870. I designed the circuit with additional features like seperating received calls, missed calls, dialled numbers along with telephone directory.
Design Caller ID using DTMF decoder MT8870 - schematic




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