Automatic release device for automatically releasing the hold-on
Communication system, exchange and communication holding...
DAA hook switch
Device for adding intercom functions to a phone system
Digital access arrangement circuitry and method for...
Hold circuits for telephone systems
Hook-flash simulation in parallel with off-hook devices
Integrated loop current detector apparatus for a PSTN modem
Method and apparatus for off-hook management of plural...
Method and device for displaying a hold service on multifunction
Off-hook disconnect and reconnect ringer device
Office line holding circuit with an automatic release function f
Receiver device for receiving ringing signals in an off-hook lin
Single-line telephone hold circuit
Static discharge snubber circuit for silicon controlled rectifie
System and method to provide control of music on hold to the...
Telephone hold circuit
Telephone line hold and hold release apparatus
Telephone line switch using an optocooupler
Telephone on-hold device