Lifeline services ensured to local access gateway telephony users by connection of local telephone string to central office and bypassing failed gateway or digital channel. Central office provides PSTN service to local telephone string allowing phone service to continue. Dual-function phones provide...http://www.google.fr/patents/US20030214939?utm_source=gb-gplus-shareBrevet US20030214939 - Method and apparatus for providing life line service to access gateway telephony subscribers
Method and apparatus for providing life line service to access gateway ...
