2.1. SBC Internal Interfaces
2.2. SBC External Interfaces
3.1. P-CSCF
3.2. eP-CSCF
3.3. E-CSCF
3.4. I-BCF
3.5. BCF
3.6. SPDF
3.7. Firewall
3.8. BGF
3.9. IMS-MGW
3.10. CCF
4.1. Admission Control
4.2. Firewalling
4.3. SIP recording
4.4. SIP SCREENING
4.5. Lawful Interception
4.6. STIR-SHAKEN
4.7. Multimedia Priority Service
4.8. Optimal Media Routing
4.9. Registration Storm Protection
4.10. Offline Charging