Lineman's hand test set
Link card circuit for electronic key telephone system
Link circuit for intercom unit
Linkage identification system
Liquid crystal displays for telephone sets and other...
Liquid crystal image display panel with integrated...
Liquid-crystal display unit for electronic directory
Listening device
Load based charging within a mobile telecommunications network
Local and remote notification of messages waiting and...
Local control panel for data recorder
Local exchange subscriber line conferencing method
Local telephony service over a cable network using packet voice
Location dependent service for a wireless telephone
Location determination in a communication system
Location identification
Lockable covering apparatus for telephone dials
Lockable telephone plug apparatus
Log-based ringtones
Logarithmic echo canceller