How to run a perl script instead of sending emails?

[Mr Gabriel]

Dear All,

I have a perl script that connects to my asterisk instance, and calls 
who ever is on shift to log in, and take care of whatever broke. I would 
like to initiate this script whenever there is a critical alert that has 
gone off more than once - how can I best achieve this?

I would like these to run instead of an email when out of hours, and 
when a critical alert has been left unattended to for some time

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