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The Polycom SoundStation 4000, 5000, 6000 and 7000 are Certified on openUC and sipXecs.
Polycom VVX
The Polycom VVX 500 & 600 are VVX300, VVX310, VVX400, VVX410, VVX500, VVX600 and VVX1500 are Certified on openUC and sipXecs.
Note: Beware that with firmware 3.3.0 and above - Polycom often times introduces new features on their phones, prior to notifying resellers. These new features in most cases will not work on Polycom Phones until the feature is introduced within sipXecs or openUC templates. A simple method of working around this is to add the new feature into a custom file which can be uploaded to the sipXecs or openUC server, and configured as a custom file within the phone itself.