VSF-Fortitude8 9.4 Release Notes

• Previous Release - VSF-Fortitude8 9.3 Release Notes

This document provides the release notes for VSF-Fortitude8 9.3 with incremental bug fix releases. The release notes for VSF-Fortitude8 9.4 describe new features, improvements and issues fixed after VSF-Fortitude8 9.3.3.1.

Release info

Name: VSF-Fortitude8
Description: VSF-Fortitude8 is a firmware for Zenitel devices based on the IMX8 processor.

The firmware is delivered in two different files:

• vsff8-9.4.3.x - Used for standard in-field upgrades
• vsff8-prod-9.4.3.x - Used in production- and recovery upgrades.

Version: 9.4.3.1
Date: 30.01.2026
Status: General Availability

VSF-FORTITUDE8 9.4.3.1

Improvements

DS-1638 The default Acoustic Echo Cancellation (AEC) profile is tuned for better double-talk and voice quality.

The default AEC filter configuration is set to do less processing of the audio signal for best voice switching, double-talk and voice quality. When installed in challenging environments using high volume settings, the AEC level might have to be set to Moderate or High to remove echo return.

DS-1585 Far-End Signal Squelch configuration changes needed reboot to apply

Now Squelch parameters are applied on the-fly when saving changes.

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.

Issues fixed

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.

DS-1633 TCIV+ and TCIS+: New equalizer (EQ) filters for improved audio quality

Created new microphone and loudspeaker EQ filters for all TCIV+ variants, 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.

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-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-4333 HD-Audio mode not working using digital microphone input

Audio is distorted when digital microphone is used. Audio is OK if using analogue microphone input