Over the air locking of user identity modules for mobile telepho
Over the head hands free phone holder
Over-current verifier circuit for an enhanced subscriber line in
Over-voltage protection circuit for use with a telephone...
Overflow call handling system
Overlapping look-up-and-add echo canceller requiring a smaller m
Overload prevention in an intelligent network
Overload protection circuit for a telephone subscriber line feed
Overload protection for on-demand access to the internet that re
Overvoltage protection circuits
Overvoltage protection scheme for subscriber loops and method of
Ozone functions handset