Your question reads as if you want your own backend system. There are some old school systems that call you on the phone you programmed is so that's the backend system.
The Perfect system you noted has the backend at that company so you pay for that monthly.
The key word here is MONITORING. We really don't need that if the system can call us or we can check on it over the web.
Read more at https://www.google.com/search?q=diy+home+security+without+monthly+fees
I want to install a home security system at my home having remote access feature. I also need a backend monitoring station who provide 24/7 monitoring. Someone suggested me Perfect Home Defense but i am still not sure, so i need honor suggestion from anyone experienced and also Thank you.