Diameter is an AAA (authentication, authorization and accounting) protocol for applications such as network access or IP mobility. The basic concept is to provide a base protocol that can be extended in order to provide AAA services to new access technologies. Diameter is intended to work in both local and roaming AAA situations. The test suite uses 3GPP Release 10 as basis for implemented elements. Additional elements (AVPs and values) from earlier releases are included in the suite for test coverage and better interoperability.