Certain features are developed together with our partner BroadSoft an may be under under a NDA agreement.
In addition we also support the Digium Asterisk method RFC 3856 and we list all supported features within the RFC and Internet Draft Support section of the Admin Guide.
This uses the dialog-info+xml method instead.
I suggest you work with your Polycom reseller in order to be brought in touch with a Polycom sales engineer as only this way you can discuss, after signing an NDA, any detailed features if possible.
Alternatively please contact me via Community mail and provide me with your complete contact details.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Polycom Global Services
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