Patent ID: 6657994
Filing Date: 2003-12-02
Classification: H04M

Abstract:
A system for providing uninterrupted voice telephony service during a cut over from telephony service provided by a first local exchange carrier to telephony service provided by a second local exchange carrier, comprising:a first telephone line configured to connect to a first voice switch of the first local exchange carrier having an assigned telephone number; a second telephone line configured to connect to a second voice switch of the second local exchange carrier having the assigned telephone number; and a derived voice customer premise equipment configured to connect to the first telephone line and to the second telephone line, said derived voice customer premise equipment is further configured to detect an off-hook state of a telephone and, upon detecting the off-hook state, detect a dial tone provided to the telephone and to selectively connect the telephone to the second voice switch; and wherein said derived voice customer premise equipment is further configured to detect a dial tone provided to the telephone upon detection of the off-hook state of the telephone.