Method and apparatus for power regulation of digital data...

Method and apparatus for prohibiting unauthorized use of a telec

Method and apparatus for propagation delay determination

Method and apparatus for providing an all digital loop with...

Method and apparatus for providing call detail records at...

Method and apparatus for qualifying loops for data services

Method and apparatus for remote maintenance procedures

Method and apparatus for retrofitting a standard coin operated t

Method and apparatus for reversibly correcting nonlinear...

Method and apparatus for routing blocked telephone calls

Method and apparatus for screening telephone calls in response t

Method and apparatus for self-testing a customer services...

Method and apparatus for simultaneous line-interface wiring...

Method and apparatus for single end loop testing for DSL...

Method and apparatus for spectrum analysis

Method and apparatus for starting switching system

Method and apparatus for supervising the accessing and testing o

Method and apparatus for surveillance of voice over internet...

Method and apparatus for tapping control in an electronic switch

Method and apparatus for telephone line testing