2600Hz Employees Alisa Posted February 16, 2021 2600Hz Employees Report Posted February 16, 2021 Hello all, Some 2600Hz partners are having difficulty operating T4xU Yealink phones that came pre-loaded with v85 firmware. Only v84 firmware has been tested and approved for use on KAZOO and there seems to be a problem downgrading from v85 to v84. We have identified a workaround for this. You can download and manually install this firmware: http://firmwares.2600hz.com/yealink/t4x/T48U-T46U-T43U-T42U-108.85.0.27.rom We are working on making this the default going forward without messing with existing phones that are happily running v84. This will take about 2 weeks. Once completed we will fully support the T4XU line again.
Logicwrath Posted February 17, 2021 Report Posted February 17, 2021 We also need v85 support for for using the T5XW series Bluetooth with Yealink's new line of DECT headsets like the WH66. I have to manually upgrade phones to v85 to pair. Also, the latest T33G v85 firmware fixes some handset audio issues.
RuhNet Posted February 20, 2021 Report Posted February 20, 2021 What are the types of issues that v85 firmware is causing?
esoare Posted February 20, 2021 Report Posted February 20, 2021 That is a great question @RuhNet! Can some one chime in and let us know what issues there have been with v85…?
Logicwrath Posted February 22, 2021 Report Posted February 22, 2021 (edited) For the T33G there is an issue around white noise generation where you can hear a sort of sine loop audio in the back ground. The newest firmware fixes most of this. It is actually a sort of sine loop audio that phases high and low. You can hear it when you pick up the handset and remove the dial tone in while the handset is still off the cradle. Edited February 22, 2021 by Logicwrath (see edit history)
Administrators Rick Posted March 9, 2021 Administrators Report Posted March 9, 2021 Hey, all, just FYI for anyone who see this, we are supporting T4xU devices again! @Logicwrath My apologies, this was not completed during this cycle. The concern here was that new T4xU phones were not able to be used for normal operation and there was no workaround available to get them working. This was because there were problems with the firmware shipping on new phones, no firmwares available on Yealink's site for these phones and an issue where v85 firmware wouldn't downgrade to v84. This left clients with phones that were completely unusable. I'd very much appreciate it if you'd submit your other items as a feature request to our product board here. @RuhNet We had reports of calls dropping while completing a blind transfer. In some versions, is would only occur while using the DSS keys, in others it would occur on any blind transfer. We also had issues with Music on hold not playing. And finally, we had an issue where v85 firmware would not downgrade to v84 firmware. @esoare ping
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