Avaya offers three layers of Cloud solutions:
1. Avaya Private Cloud = Avaya direct custom solutions for 20,000+ endpoints.
2. Avaya Powered Cloud = aka OnAvaya -> Avaya CSP (Aura enterprise) and BusinessPartner (IP Office SME)
3. Avaya Branded Cloud = Avaya retail (AvayaLive, etc.)
For enterprise class solutions, you will want to verify the provider is an authorized Avaya Cloud Service Provider (CSP) as there are only a couple today in North America for the Aura Platform. (There are plenty out there if you are looking for hosted IP Office).
NuStratus by VOXNS is one of the only Avaya CSP offers certified today that provides private secure single instance (not partitioned) Aura solutions in a Tier IV Gold Data Center.
See the architecture at:
http://www.slideshare.net/voxns/avay...ider-nustratus