Diameter Protocol Overview¶

The Diameter protocol is a fundamental component of modern telecommunications networks, serving as the successor to RADIUS. This document provides a comprehensive overview of our Diameter protocol implementation.

Supported Interfaces¶

Our API supports the following Diameter interfaces:

Gx Interface¶

Policy and Charging Control (PCC)
Real-time credit control
QoS management
Detailed Gx Documentation

Rx Interface¶

Application-specific policy control
QoS reservation
Service flow management
Detailed Rx Documentation

Ro/Gy Interface¶

Online charging
Real-time credit control
Session management
Detailed Ro/Gy Documentation

Key Features¶

High Availability¶

Active-active deployment
Automatic failover
Load balancing
Geographic redundancy

Performance¶

Low latency (< 50ms)
High throughput (10K+ TPS)
Efficient connection management
Connection pooling

Security¶

TLS 1.3 support
Certificate-based authentication
IP whitelisting
Comprehensive audit logging

Implementation Guide¶

Basic Setup¶

import { DiameterClient } from '@telco-api/diameter';

const client = new DiameterClient({
  host: 'diameter.telco-sec.com',
  port: 3868,
  origin: 'client.example.com',
  destination: 'server.example.com',
  applications: ['Gx', 'Rx'],
});

await client.connect();

Example: Credit Control Request¶

const ccr = await client.gx.sendCreditControlRequest({
  sessionId: 'session123',
  subscriptionId: 'sub456',
  serviceIdentifier: 'video-streaming',
  ratingGroup: 1,
  requestedServiceUnit: {
    timeUnit: 3600,  // 1 hour
    totalOctets: 1024000  // 1MB
  }
});

Monitoring & Troubleshooting¶

Metrics¶

Connection status
Request/response latency
Error rates
Transaction volumes

Logging¶

Transaction logs
Error logs
Debug logs
Performance metrics

Best Practices¶

Connection Management
Maintain persistent connections
Implement proper connection pooling
Handle reconnection gracefully
Error Handling
Implement proper timeout handling
Use exponential backoff for retries
Handle protocol-specific errors
Performance Optimization
Use connection pooling
Implement request batching
Monitor and tune system parameters
Security
Use TLS for all connections
Implement proper certificate management
Regular security audits

Advanced Topics¶

Custom AVPs¶

Learn how to implement custom Attribute-Value Pairs for specific use cases.

High Availability Setup¶

Detailed guide on setting up redundant Diameter nodes.

Performance Tuning¶

Guidelines for optimizing Diameter protocol performance.

Reference¶

Standards Compliance¶

RFC 6733 (Diameter Base Protocol)
3GPP TS 29.212 (Gx Interface)
3GPP TS 29.214 (Rx Interface)
3GPP TS 32.299 (Ro Interface)