Audiocodes has released an updated 3.0.1 version for all 400HD models. Comparing to the 3.0.1 GA, this version includes mainly bug fixes. Please refer to the new release notes document to see the list of fixes. For customers that still did not move to 3.0.1 GA and plan to move to 3.0.1, it is recommended to use this version (instead the 3.0.1 GA).
According to my source, these new firmwares are anticipated to be posted to the AudioCodes website (www.audiocodes.com) sometime early next week. In the meantime, my phones (420, 440, 450) seem to get along right well with the new code.
As an interesting side note…my web login/BToE combination now works as expected. Previously this was not working, and I know our corporate IT recently changed the Office 365 BToE status, and it could have been the firmware. If you are having issues, maybe this firmware will help you.