List of requirements for smoke detection system

Smoke detection
Interconnection (one goes off they all go off)
Ability to silence the whole system without some special access key and keep it silenced for some small period of time without manually having to turn it back on (snooze)
Ability to run off battery power for x years (let's say 3 min)
Ability to report via SMS / phone calls to a list of people
Primary and backup internet connection for reporting (e.g. ethernet and fallback to 4G)
No cloud subscription required (a VOIP subscription for sending SMS and calling is ok but shouldn't be tied to one provider)
No IT infrastructure maintained by us (we don't want the reporting function to fail if one of our servers goes down)

Nice to have:

CO detection
Report tells us which of the alarms that detected the smoke so we don't have to search all of Omni
Ability to engage the snooze feature from more than one location
Ability to run a system test where messages are sent but include some "THIS IS NOT A REAL EMERGENCY" header

Smoke and fire