Enhanced ED-137 Recorder Interface Validation for Air Traffic Management Networks

6th, Mar 2026

Gaithersburg, Maryland, USA – March 2026 – GL Communications Inc., a global provider of voice testing solutions, announces enhanced capabilities in its Message Automation and Protocol Simulation (MAPS™) ED-137 Recorder Emulator, enabling structured validation, automation, and performance testing of VoIP recorder interfaces prior to deployment.

MAPS™ is GL’s protocol simulation and traffic generation platform, and its ED-137 Recorder Emulator application validates VoIP-based recorder interfaces in Air Traffic Management networks.

As Air Traffic Management networks transition to IP-based and multi-vendor architectures, recorder interoperability, session reliability, and metadata accuracy have become increasingly critical. Structured validation of recorder interfaces ensures compliance, operational integrity, and reliable recording of Air-to-Ground and Ground-to-Ground communications.

MAPS ED-137 Recorder Interface Emulator

Why Air Traffic Management Teams Choose MAPS™ ED-137 Recorder

  • Emulate Controller Working Position (CWP), Ground Radio Station (GRS), and Recorder endpoints
  • Validate Air-to-Ground and Ground-to-Ground recording scenarios
  • Stress-test hundreds of Real Time Streaming Protocol (RTSP) recording sessions
  • Automate regression testing using expanded Python APIs
  • Verify Call Record Data including R2S and R2S-TLV metadata
  • Perform RTSP session keep-alive and liveliness validation
  • Support traffic actions such as Talk using microphone, Playback to speaker, and Send and Record audio files
  • Generate per-session audio recordings with CSV-based traceability


What’s New

Recent enhancements include:
  • Improved codec and user agent profile handling
  • Enhanced IPv6 support and RTSP robustness
  • Expanded Python API support for automation and scripted regression testing
  • Call Rejected by GRS feature at the CWP client
  • Validation support against VOTER systems
  • Support for RTP over UDP with user-defined Client and Server port configuration


Standards and Technical Compliance

MAPS™ ED-137 Recorder supports:
  • EUROCAE ED-137B Volume 4 Recorder
  • EUROCAE ED-137C Volume 4 Recorder (Change 1 and Change 2)
  • RTSP session control and RTP media transport
  • IPv4 and IPv6
  • G.711 A-law, μ-law, and G.729 codecs

The solution supports advanced operational scenarios including Voting, Simultaneous Squelch, Start/Stop Squelch, Simultaneous Call Transmission (SCT with SQL ON), Call Intrusion, Call Transfer, Call Hold, Attended Transfer, Conference Join and RTSP session timeout validation.


Part of GL’s Complete Air Traffic Management Test Suite

MAPS™ ED-137 Recorder is part of GL’s comprehensive Air Traffic Management testing portfolio including:

MAPS™ ED-137 Recorder Emulator enables structured development, integration, regression, and acceptance testing across modern IP-based Air Traffic Management infrastructures.

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