Organization of simplex / duplex communication between one or several subscribers. Support for group calls as well as point-to-point calls.

Specifications:
* CPU: NXP iMX6ul;
* DDR3: 256 MByte;
* NAND: 512 MByte;
* SPI NOR flash 1 MByte (for bootloader);
* SD card: microSD, upgrade \ user memory;
* 2 x relay group output;
* 1 x input typing field with backlight;
* 1 x I2C connecting devices;
* 1 x input for keyboard connection;
* 1 x connector for recording negotiations;
* 1 x headphone jack (active speaker) output;
* 1 x microphone connector (with backlight);
* 1 connector for RGB display;
* 1 USB connector for configuration;
* 1 x LAN connector without PoE;
* 1 x LAN connector with PoE;
* 1 connector for connecting an external loudspeaker (built-in amplifier 25 W);
* 1 connector for handset;
* 1x power (12V);