SIP / VoIP gateway is based on the carrier board with a digital bus, on which the bladed interface modules can be installed (see starting from the upper right corner). The photo shows 6 modules installed and two more free space for the left. Interface modules have connectors for external audio devices. In the lower left corner is shown embedded ARM / DSP computer module.
The gateway is designed to provide the functions of digital voice “Voice over IP” (VoIP) and switching media streams via SIP in the air traffic voice system controller – pilot, according to the requirements of the standard ED-136 and ED-137 A / B EUROCAE.