The CX5000 was end of sale back in 2012 and end of support was in 2017.
As outlined in the datasheet >here< it was designed for Panoramic usage with:
Lync 2013 or Skype for Business
No other client has been tested.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
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