Multipurpose headset amplifier
Multipurpose hinge apparatus for foldable telephones
Multipurpose subscriber local line monitoring device
Multirate speech codecs
Multisensing circuitry for class signals and stutter dial tone i
Multisensing circuitry for class signals and stutter dial...
Multiuse telecommunications power system
Multivariate rate-based overload control for multiple-class...
Multiwire-pair telecommunications test system
Musicians telephone interface
Mute status reminder for a communication device
Muting circuit for telephone answering machine
Muting conference call hold music