Microsoft has announced changes related to the Microsoft Online device registration requirement. These changes affect Polycom Trio 8800 systems registered for Skype for Business accounts. Before upgrading your Microsoft environment Polycom Trio 8800 system to version 5.9.1 Rev AA or later, see the Technical Advisory for specific changes and actions required.
Link to the previous 188.8.131.5219 Rev AA => here <=
What’s GA In this Release?
Trio 8300 support (A Poly Trio 8300 platform-specific Trio 5.9.1AA SW image will be made available when the phone starts shipping) Trio 8300 Software Provisioning
Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels. Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's