GL Releases Voice Recorder Emulator for VoIP Air Traffic Control

May 3, 2018

GL Communications Inc. announced May 3, its latest ED-137 Voice Recorder Emulator software referred to as MAPS ED-137 Recorder Emulator.

Vijay Kulkarni, the CEO of the company said, “Air traffic control centers are required to provide continuous "ground/ground" and "ground/air" voice communication recordings with synchronized flight related data, for establishing “air traffic incident” chronology, replay, improving safety, audits, statistics, and training purposes.

ED-137/4B defines interoperability standards for the next generation VoIP Air Traffic Recorder. These next generation recorders are specially designed for all traffic control towers and centers to simplify the recording, archiving, and playback of voice communications.”

He added, “MAPS ED-137 Recorder Emulator software emulates voice recording and replay of voice communication for VoIP ATM networks per EUROCAE ED-137B Volume 4 Standards. This software is an addition to the already existing test suite for VoIP ATM networks that includes MAPS™ ED-137 Radio Emulators and MAPS™ ED-137 Telephone Emulators.”

Kulkarni further explained, “The software is designed to simulate Recorder Interface for both Air-to-Ground (AG) and Ground-to-Ground (GG) calls at Controller Working Position (CWP), Ground Radio Station (GRS) and Communication Recorders endpoints.

MAPS ED-137 Recorder supports Real Time Streaming Protocol (RTSP) to establish, terminate and maintain media sessions, which deliver media recording servers. Active recording requires an established session (i.e. a certain number of parameters that are exchanged between entities prior to any recording). CWP/VCS, Radio and Recorder use RTSP for such sessions. As RTSP relies on a transport layer protocol (TCP or UDP), these entities use SIP to exchange capabilities and connection information (i.e. IP address, port number, and transport protocol).