If you change it you may be in violation of NFPA72 requiring 8 hours of runtime on a power failure. If cutting your bottom line is such a stress on your budget I would suggest not cutting costs when it comes to life-safety issues.
So there is no difference between this and using the cellular elevator phone communication module such as Telguard TG-1B which uses cell phone signal to call out for help.
The only difference is the Telguard has a integrated battery backup in the unit and the OOMA Telo does not.
That can be solved by adding a large enough UPS to give you the 8 hours back on both the OOMA VOIP until and the Comcast modem.
Actually in my state, I think it might be more like 12 hours. Is the 8 Hour a federal law?
You know, this elevator is also hydraulic so I think they will slowly drop to the lowest floor if power goes out right?
So bottom line as long as I have a UPS with enough hours of battery backup, there is no restriction on VOIP to contact out on the emergency phone?
Thanks.
