This image explains it: http://markbowers.org/cms/files/Image/robot/signalflowchart.png
The DTMF decoder outputs a 4-bit number. That goes into a 4-bit decoder, and relays are hooked up to the outputs of that.
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This image explains it: http://markbowers.org/cms/files/Image/robot/signalflowchart.png
The DTMF decoder outputs a 4-bit number. That goes into a 4-bit decoder, and relays are hooked up to the outputs of that.