How to setup a macro


I have a door unit connected to a fxs that opens door when a digit 5 is hit.
so today we have the workers in the office pick up the phone and hit the 5 key if a call is incoming from door 1 .

What I would like to do is open the door by caller id or through ivr with password.
calling to the fxo line will give you an ivr , once you hit a password it will call the door fxo extension and send the 5 key. a better option would be not picking up the call at all, cross the caller id with a whitelist and execute the open door script as mentioned above.

I saw some macros online but I didn’t entirely get the feel of it.
so any “hello world” examples would be much appreciated.

any help is much appreciated.


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cheers thanks