ZIPS 9.5 - Release notes

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This document provides the release notes for VSF-Fortitude Audio Only 9.5 with incremental bug fix releases. The release notes describe new features, improvements and issues fixed after VSF-Fortitude Audio Only 9.4.3.1.

Release info

Name: VSF-Fortitude Audio Only
Description: VSF-Fortitude Audio Only is a firmware for Zenitel devices based on the IMX8M Nano processor.

The firmware is delivered in two different files:

• vsff8mn-9.5.3.x - Used for standard in-field upgrades
• vsff8mn-prod-9.5.3.x - Used in production- and recovery upgrades.

Version: 9.5.3.0
Date: 10.06.2026
Status: General available

VSF-FORTITUDE Audio Only 9.5.3.0

Fixed Issues

MTN-4860 Fixed an issue where calls using SRTP encryption could produce random noise at the start

In delayed-offer SIP scenarios (e.g., with IPC Unigy), encrypted audio packets could arrive before the decryption key was established. The device now silently discards these packets, ensuring clean audio from the start of every encrypted call.

DS-1639 Fixed an issue with GPIO pin on ZIPS speakers did not work when configured as output

GPIO pins on ZIPS speakers configured as output via the Relays/Outputs page would not execute the assigned action. The GPIO output now works as expected in all configuration methods.

Security fixes

DS-1720 Disabled SNMP port by default in firewall

The SNMP port is now disabled by default in the firewall on all new and factory-reset devices. Customers who require SNMP must enable it manually in the device configuration before use.

DS-1683 Security Update

Resolved vulnerabilities related to CVE-2025-15467 - Stack buffer overflow

Action: Upgrade to 9.5.3.0 or later

DS-1662 The SSH password to Zenitel devices in 9.5 release has been changed

Due to stricter cybersecurity requirements Zenitel has decided to protect against threats by limiting SSH access