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Want to know, some newbie question

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ClouDxv1

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What kind of hardware that some house alarm system uses to auto call out if the alarm activated?
 

ClouDxv1 said:
What kind of hardware that some house alarm system uses to auto call out if the alarm activated?
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If you are asking about telephone call it, can be achieved using DTMF dialer
 

Other way to make calls could be the use of AT commands trhu the serial port of some cellphones.
 

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