Turbine 9.4 - Release notes

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This document provides the release notes for VSF-Turbine 9.4 with incremental bug fix releases. The release notes describe new features, improvements and issues fixed after VSF-Turbine 9.3.3.1.

VSF-Turbine (vsft) is a firmware for Zenitel devices based on the IMX28 processor.

Release info

Name: VSF-Turbine
Description: VSF-Turbine is a firmware for Zenitel devices based on the IMX28 processor.

The firmware is delivered in two different ZIP archives and one swu file:

• vsft-9.4.x.x - Used for standard in-field upgrades
• vsft-prod-9.4.x.x - Used in production- and recovery upgrades

Version: vsft-9.4.3.1
Date: 30.01.2026
Status: General Availability

VSF-TURBINE 9.4.3.1

Improvements

DS-1634 TCIS-x: Changed the Acoustic Echo Cancellation (AEC) and Active Noise Cancellation (ANC) factory defaults settings to “Low”

This is to get the best out-of-the-box audio quality experience when installing in low to moderate noisy environments. When installing in more challenging environments using high volume settings, some tuning might be needed by setting AEC and/or ANC to “Moderate” or “High”.

DS-1601 Added support for the TA-10 Relay module in Zenitel Connect Pro

Added support for the TA-10 relay module, the relay module is now configurable in Zenitel Connect Pro.

DS-1516 Relays/outputs can now be triggered by multicast paging streams

The activation is following the audio stream priorities in the multicast paging.

DS-769 STUN support for intercom devices (Tech preview)

Basic STUN support is added for intercom for peer to peer RTP media between two intercoms that communicate over public PBX.

When STUN is configured to communicate on local network hairpin rules are required on router.

Fixed Issues

MTN-4879 Audio quality tuning

• Increased microphone gain (up +6 dB) to improve voice quality and voice switching, and reduce impact from the Active Noise Cancellation (ANC) algorithm
• Tuned the Acoustic Echo Cancellation (AEC) and the Active Noise Cancellation (ANC) algorithms with more focus on clean Near-End Voice Quality and improved voice switching and double-talk.
  • AEC Profiles "low" and "medium" focus on Near-End signal quality at lower volume settings
  • AEC Profiles "high" and "half-duplex" focus on removing echo return on higher volume settings and when mechanical distortions are high. Use this only when having issues with echo return.
• The ANC level profiles has been slightly modified with more focus on cleaner near-end voice and somewhat less noise suppression.
• Created new microphone and loudspeaker EQ filters, resulting in a more flat frequency response and a reduction of some loudspeaker resonances. This allows for less Acoustic Echo Cancellation (AEC) filtering resulting in improved mic voice signal, and at the same a more pleasant sound quality from the loudspeaker.

MTN-4834 The Active Noise Cancellation (ANC) level “Low” did take effect after start-up

The ANC Level "low" will now be applied after start-up of the device, not only after changing to "low" during operation. This bug affected the “low” configuration level only.

MTN-4820 The Volume settings in the web interface accepted input values outside the defined maximum/minimum range.

Volume settings now only accepts input values within the defined maximum/minimum range.

MTN-4478 Fixed an issue where reboot was required after disabling DAVC Algorithm

Now modifying the “Enable AVC Algorithm” change will apply on-the-fly both on enable and disable. This will simplify experimenting with running the AVC algorithm on AVC source or AVC player side. The general recommendation is running AVC Algorithm on the player/receiver side. This ensure the AVC lock to work without sending audio also to AVC source(s).

DS-1600 Fixed an issue where OLED display text kept scrolling even when scrolling timer was set to 0 on TCIS-4/5 and TCIV-5+

This has been corrected so that the text no longer starts scrolling when the scrolling timer is set to 0.

DS-1574 Fixed an issue where the device became non-functional after enabling and then disabling the "Detailed Logging".

DS-1568 Fixed an issue where second Permanent Audio Stream (PAS) would not start

The PAS stream 2 under special config page zForm_stream_config should now stream as expected.

Known issues

MTN-4883 The default microphone signal from the IP Hotline station (1008070010) is too high

Audio from the IP Hotline handset is louder than audio from other devices. Workaround is to adjust the Microphone gain to -10dB in the Audio Settings in the web interface of the IP Hotline station.