1. ITU Recommendation Q.1200: General series intelligent networks recommendations structure
2. ITU Recommendation Q.1201/I.312: Principles of intelligent network architecture
3. ITU Recommendation Q.1202/I.328: Intelligent network service plane architecture
4. ITU Recommendation Q.1203/I.329: Intelligent network global functional plane architecture
5. ITU Recommendation Q.1204: Intelligent network distributed functional plane architecture