1.1. Core network components
1.2. DBs in Core network
2.1. Architecture
2.2. DB’s content
2.2.1. IMSI
2.2.2. MSISDN
2.2.3. Authentication information
2.2.4. Services
3.1. Mobility management
3.2. Authentication
3.3. VLR update
3.4. SMS delivery
3.5. SRI related queries