19.12. Summary
The Diameter Protocol is used to provide AAA services for a range of access technologies. It is loosely based on an existing AAA protocol called RADIUS, which has been used widely for dial-up and terminal server access. The Diameter Protocol uses a binary header format and is capable of transporting a range of data units called AVPs. The Diameter Base Protocol specifies the delivery mechanisms, capability negotiation, error handling and extensibility of the protocol, whereas individual Diameter applications specify service-specific functions and AVPs. In addition to the base protocol which includes accounting, 3GPP IMS currently makes use of two other Diameter applications: namely, the Diameter SIP application and the Diameter credit control application.
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