I have been frustrated at the quality of many of the "insteon" components in my system. So I have been looking to upgrade. The one component in my system that has been rock solid reliable is my ELK security system. I have also found security devices to be a little more reliable. So this is what I am thinking. Expand my elk to connect ALL my devices. I can get a zwave module and a GE 2 way wireless module for the elk. I can then use my ISY99 to control the devices through the elk and pick up my legacy insteon devices. One thing I have found is wireless devices like insteon are not reliable because there is no handshake. If the go offline you do not know. Why I like the ge as well as a wired connection a little more work but I know it will work when it needs to.
Well i think you should also check the perfect home defense security system.
They have the techology of intergrating system and Fastest response time in the industry with 2way voice communication, Which eliminates the risks of any false alarm.Top of the line “Smash and Crash” technology keeps the system running and it's wireless using Zwave no need of wifi also and you can access all your devices from your mobile phone.
There contact number is Toll Free 800-533-[ restricted ] OR visit there site at perfecthomedefense.
The ISY99i has been discontinued for a few years now. The last firmware is 3.3.10. As the later firmware is too big to fit an ISY99i. As long as your not using newer Insteon modules that need a newer you are probably OK.
I don't think the UDI ZWave board fits an ISY99i. If ELK has a ZWave board I can't say how it would interface with an ISY99i.