Believe me, I've thought about it. There's a lot more to do than just designing the device. There's service components to the whole system as well (porting nu

Believe me, I've thought about it. There's a lot more to do than just designing the device. There's service components to the whole system as well (porting numbers, signing people up, subscriptions, E911 services, etc). >You then battery back it with a lead acid cell. Well you also need to pump it up to 90VAC for ringing. Again, more details but they are important ones.