Microsoft Vendor-specific RADIUS Attributes  Application ( 2548 )

These attributes are designed to support Microsoft proprietary dial-up protocols and/or provide support for features not provided by the standard RADIUS attribute set.
Reference:  RFC 2548   View
MESSAGES

Name

Code

Access-Request-2548 1
Access-Accept-2548 2
Acct-Request-2548 2
Access-Reject-2548 3
Access-Challenge-2548 11