I can only provide the same advice as with the 3 other posters before.
The latest software since this post was started is currently UCS 4.0.4 and if the issue still exists there for the VVX500 then I can only advise you to please raise a ticket via your Polycom reseller with Polycom support.
So far non of the other people who posted provided any feedback in regards of a raised ticket.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Polycom Global Services
---------------- The title Polycom Employee & Community Manager is a community setting and does not reflect my role. I am just a simple volunteer in the community like everybody else. My official "day" Job is 3rd Level support at Poly but I am unable to provide official support via the community.
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