Call admission control method and cell flow monitoring method in
Call blocking system
Call detection control apparatus
Call screening at a hierarchical switch based on organizational
Call screening device
Call screening in a public telephone station
Call screening using subscriber specified timers and schedules
Call-processing system and method
Caller discrimination within a telephone system
Calling party identifying apparatus and method therefor
Cellular telephone unit capable of automatic interaction with au
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