This package flashes software to your phone.
Trio 5.9.1.11135
https://support.polycom.com/content/dam/polycom-support/products/voice/realpresence-trio/release-notes/en/trio-release-notes-5-9-1-ac.pdf
https://documents.polycom.com/bundle/trio-ag-5-9-1-AA/page/c-ucs-ag-product-overview.html