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
Rick's post in Yealink T4xU Phone Issue & Workaround was marked as the answer