Cisco Systems Oy LM Ericsson Ab Sun Microsystems The Diameter protocol provides Authentication, Authorization and Accounting for network access technologies, such as NASREQ, ROAMOPS and Mobile IP. This extension describes how accounting records can be securely transmitted over the Diameter protocol. When combined with the Strong Security extension, accounting records MAY traverse intermediate proxies in a secure fashion and is compatible with the referral broker model. This extension allows real-time accounting transfers.