Monitoring Software for SIP Extensions on Freeswitch/FusionPBX

Hi, Hope you guys can help me with this requirement or introduce someone who can create a software for me for Freeswitch/FusionPBX Below I have described the best I can. Thank you. Guy Situation: I would like to create application addon to my freeswitch server. I work in a CCTV and alarm service and installation company. Most of the houses we visit has no phone lines. But they all do have internet, either ADSL or Fiber. Our Alarm and CCTV system has the option to connect to a phone line to call customer in the vent of an alarm trigger. Because of most of the houses do not have a phone line, we have to propose a GSM Voice module to create the phone port we want. This cost a bit as an additional GSM Module is required and you have to pay for the SIM Mobile Plan as well you hardly use. Requirement: As a part of our service, we would like to offer the customer a VoIP ATA (linksys) free of charge, which is an extension of our Freeswitch. So, each customer will have a SIP extension. Alarm and CCTV will ring the customers mobile via our Freeswitch to notify the alarm. It is the most cost efficient solution we can offer customers at the moment. Issue: First question the customer would ask is, "What happens when the internet goes down?" Although Landlines and GSM also can go down, I would like to find a close enough solution to answer this question. Solution: I would like to create a program with a separate UI on freeswitch to monitor SIP registrations. If you are good with FusionPBX, best solution is to have an additional page on FusionPBX is even better. The new program will monitor these extension every say 120sec for example. If it sees any extension drops, the system will call the Customers mobile and Play a VOICE Clip (Saying we have difficulty monitoring your service at the moment) And this notification will repeat every say 20min for example, each hone number rotating, untill the SIP registration comes back online. Admin gets a notification email periodically every time the SIP extension is down too. You can develop the APP on a separate webserver and connect to the Freeswitch server to read the log files, if that's possible. Details to store : Customer Name Notification Phone Number 1 Notification Phone Number 2 Notification Phone Number 3 - admin email address Freeswitch Extension Number Log each event - for future reporting option to develop. Enable / Disable So, we can be a bit responsible of providing an alternate solution for a self monitoring system for the voip line.