MULTIFUNCTIONAL USER TERMINAL Russian patent published in 2015 - IPC H04M9/08 

FIELD: radio engineering, communication.

SUBSTANCE: device comprises a processor, a memory unit, input/output device controllers, a main line adapter and an Ethernet interface controller, wherein the main line adapter and the Ethernet interface controller of the channel side are connected to an external main line, peripheral devices; the device further includes an acoustic signal switching device consisting of a digital interface controller, a signal converter, a voltage divider, an S1-TCH interface controller, as well supply voltage, interface switching, cut-off voltage, matching and audio frequency power amplifier units.

EFFECT: providing uninterrupted reception-transmission for telephone communication using public-address equipment.

1 dwg