Method and device for access communication/control
Method for influencing a signaling procedure with the assistance
Method of establishing communication link to one of multiple dev
Patient operator intercom arrangements for magnetic resonance im
Personal handy phone system
Portable through-door intercom
Remote answering of doorbell
Single line telephone communication system
Single-wire data distribution system and method
System for communicating through partitions
Telephone adaptor for telephone sets
Telephone installations
Telephone system
Two-telephone intercom
Two-way communication system with selective muting