A system and method are presented for providing a telephone service. An analog signal is received from a telephone and the analog signal is converted into a digital signal in a first format. A modem is provided for receiving the digital signal in the first format. A digitizer is also provided for receiving...http://www.google.com.au/patents/US7050546?utm_source=gb-gplus-sharePatent US7050546 - System and method for providing POTS services in DSL environment in event of failures
