Diameterserver

Diameterserver is a software component that implements the Diameter protocol to provide authentication, authorization, and accounting (AAA) services in computer networks. It typically acts as a server in a client–server setup, handling requests from network elements such as access gateways, policy servers, or application servers and returning responses that authorize services or record usage.

Diameter is a successor to RADIUS, designed for high scalability and extensibility. A diameterserver processes Diameter messages composed of attribute-value pairs (AVPs) that convey user identities, service types, and session data. Sessions are established over TCP or SCTP, with optional TLS for security and IPsec as needed. The protocol supports roaming and charging features through dedicated applications such as those handling credit-control and roaming scenarios.

Diameterservers are deployed in telecom and enterprise networks to manage AAA for mobile core networks (IMS, LTE/EPC, and 5G core), Wi‑Fi roaming, and enterprise VPNs. They are commonly part of a network’s policy, charging, and messaging framework and can interface with subscriber databases and home or visited networks. Implementation choices vary across vendors and open-source projects, but typical deployments offer features such as clustering, load balancing, failover, and comprehensive monitoring and logging. Configuration generally covers the supported Diameter applications, AVP formats, and security options aligned with the operator’s architecture.

Standards for Diameter and its applications were published by the IETF in the mid-2000s, notably the Diameter Base Protocol and related documents. The term “diameterserver” denotes the server-side component that implements these protocols within broader network infrastructures.