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DTMF part cannot function when i do it in lab, but ok when do it in the home/office.

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MIAO

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hi,

i am a student who are doing the final year project . i have done a simple light control system which remotely control via telephone.
Everything function well when i do it at home , but when i want to use the telephone in the laboratory, my hardware is not function, ring detect is ok but DTMF signal cannot send to my hardware. After that, i move the hardware to my supervisor's office and try again, it is function well. my supervisor said that it may due to the current problem, maybe the telephone of lab is not enough current to send the signal to my hardware.

Can i have a some more information about this issue?
 

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