... would like to have a fire alarm system that dials out and can display the triggering device.

Mike, many states require the installer of security and fire systems to be licensed so I would check to see if you are allowed to do this work. Second, even if you can install it your customer will need central station monitoring. Monitoring companies are not going to want to talk to you unless you do this work regularly and give them business regularly. Third is the liability issue. Security and fire system work will usually cost you more for insurance coverage, chack with your agent.

If I were you I would pass on this and refer it to a security company.

-Hal