09-12-2013 07:58:32 AM - edited 09-12-2013 12:26:31 PM
val3233 - U-verse voice is transported VOIP over the internet via the RG. The RG runs on standard AC. If you lose commercial power you would not be able to use the phone. This provides power for something like eight hours so that you can use your phone.
Cable companies have a similar device for their phone service.