Apparatus and method for providing music-on-hold service in...
Communication apparatus having a communication hold function
Communication console station with priority queuing
Digital key telephone system and extension terminal device...
Diverter interface between two telecommunication lines and a sta
Hold detecting and control circuit for a key telephone system
Hold-off alert system
Key telephone system
Key telephone system with means for operatively connecting anoth
Multiple line self-contained telephone
Multiple phone line adaptor
On-hold messaging system and method
On-hold messaging system and method
On-hold messaging system and method
On-hold messaging system and method
Stand-alone keyphone system
System and method for local replacement of music-on-hold
Telephone and telephone system having temporary transfer and hol
Telephone conversion device
Telephone main unit and telephone control apparatus