Three tier alert system, and how to invoke an external script?

[Mr Gabriel]

Is it possible to do the following;

There are five people, three groups of people who should be notified in 
case of any issues. the three groups of people each have three ways of 
being notified.

Group One -> Help Desk Team
Group Two -> IT Support Team
Group Three -> Management

First notification is email, the second is text message, and the third 
one is by phone. Email is already configured. We have a perl script that 
can be run to send messages, and also a perl script that can connect to 
our asterisk boxes to make calls.

On the first alert, notify group one by email, and ignore the second and 
third group.
If no acknowledgment is recieved, run perl script for SMS with group one 
by, and group two notify by email
If again no acknowledgment is received, run script for phone calls, and 
script for SMS/email to group three.


I would like to know if such a setup is possible, and any hints and tips 
as to where I should be looking to figure it out. Before I forget, how 
can I invoke an external script, which is stored on the same server as 
nagios?


Thank you

-- Mr Gabriel

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