Cordless phones powered by Phone company power
I am an engineer but with limited experience in telecom. I have yet to locate a cordless phone for residential use that can operate off the phone company's DC power source for any useful length of time so as to not require (at least for the base station)an AC connection for power. Does this technology exist to your knowledge? If not, are you aware of the barriers or obstacles to developing such a device, whether technical or because of regulatory issues? Thank you in advance for your consideration.