Hello @Harishyadav1465,
welcome back to the Polycom Community.
Again a post should contain information about current software, SIP Server details etc. but to answer your question the Admin Guide matching the software version usually lists the RFC's we support.
This is a public facing document so easily available.
In addition we do have non public facing documentation for which you can potentially get access whilst working with a Polycom sales Engineer as this may require a NDA to be signed.
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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