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here weamp;#39;re going to talk about how touched own work touched on work using a signaling type called DTMF which stands for a dual-tone multi-frequency now as we know if you want to make a phone call you take the phone off hook and when you do that you close the switch within the phone by closing that switch you cause a current flow from the neck 48 volts DC the moment this current starts to flow the dial tone is activated so the phone would receive dial tone so the moment you receive dial tone you know itamp;#39;s time to start dialing the phone is program with a signaling type called dual-tone multi-frequency dialing now letamp;#39;s say the first number you dial is in the number five here you would generate two frequencies seven seven zero Hertz and 1326 Hertz these two frequencies are sent back to the switch the switch is also programmed to recognize DTMF frequencies so the switch would know that the two frequency seven seven zero Hertz are 1326 hers represents the number fiv
