Stating or asking the latest software does not help others when finding this post in days, weeks, months or years to come as they do not know what software mentioned was current at the time of writing.
Please therefore always post the exact complete build id.
Therefore the Polycom VoIP FAQ contains this post here:
Question: How can I find out my SIP or UC Software Version of my Phone?
Resolution: Please check here
Om addition the Skype for Business FAQ contains:
Jun 15, 2016 Question:Unable to receive content from a Skype for Business 2016 client
Resolution:The RealPresence Trio 8800 does currently not support VBSS. please check => here<= as a workaround
We do not discuss unreleased software within this community and UC Software 5.5.2 does not have a VBSS support.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Polycom Global Services