Call coverage arrangement
Call processing system with resources on multiple platforms
Call progress tone system
Call waiting notifying apparatus
Calling signal controller
Calling system for enabling speech transmission from a caller to
Central office control of receive and transmit handset volume
Circuit and method for reducing common mode interference in tele
Collective-house control system employing an interface circuit f
Communication apparatus having a communication hold function
Communication apparatus with private branch exchange for communi
Communication console station with priority queuing
Communication system having dynamically assigned station set but
Communication system having multi-mode line selection buttons
Communication system having separate unidirectional information
Communication system with assembly carrier unit
Communication terminal apparatus
Concurrent hunt group searching methods and arrangements
Control and interface apparatus for telephone systems
Control of incoming and outgoing calls in a key system