Hello Nullifier,
welcome to the Polycom Community.
The 80xx Series is SIP only and would need a gateway between the LYNC Server and their SIP Server.
The 8400 Series recently received an Software Update 4.1.0 which has not yet made publicly available so I am unable to share the exact details of the supported features.
Once I can comment on this I will update this post.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services
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