Centralized call processing
Centralized voice over IP recording and retrieval method and...
Clip-on fraud prevention method and apparatus
Coded phone security system
Communication facilities access control arrangement
Communication request processing system communication...
Communication support system for providing security of...
Communication support system for providing security of...
Communication terminal unit for connection to an ISDN
Computer-based method and apparatus for controlling, monitoring,
Computer-based method and apparatus for controlling, monitoring,
Computer-based method and apparatus for controlling,...
Computer-based method and apparatus for controlling,...
Computer-based method and apparatus for controlling,...
Computer-based method and apparatus for controlling,...
Computer-based method and apparatus for controlling,...
Connection management servicing method for communication...
Consistency of state model visualization across different...
Controllable annunciator using ring signal
Copy protection of software for use in a private branch exchange