Virtual Roaming Systems for GSM, GPRS and UMTS: Open Connectivity in Practice

Preface. By the Same Author. Abbreviations and Acronyms. 1 'Virtual Roaming' Purpose and Principles. 1.1 Mobile Services Affected by Virtual Roaming. 1.2 Virtual Roaming Hub for Inbound Visitors' Service (Single IMSI). 1.3 Virtual Roaming Hub for Outbound Subscribers: Multi-IMSI. 1.4 Brief Introduction to Standard Bilateral Roaming Procedures. 1.5 Principles of the SS7 Protocol Layers Used in Roaming Procedures. 2 Architecture of Virtual Roaming Systems. 2.1 SCCP, MAP, CAP and GTP Transformation Principle in the Roaming Hub. 2.2 Procedures for the Virtual Roaming Visitors' Service (Single IMSI). 2.3 Restriction of Virtual Roaming by the Roaming Hub. 2.4 Procedures for the Virtual Roaming Visitors' Service (Multi-IMSI). 2.5 IS 41 MAP GSM Inter-standard Roaming Hubs. 2.6 Various MAP and CAMEL Transformation Methods. 2.7 Appendix of Chapter 2. References and Further Reading. 3 Connecting the VPLMN MNOs to a Virtual Roaming Supplier. 3.1 MNO Configuration vs Roaming Hub Supplier Configuration. 3.2 Connection to the Roaming Hub Service, MNO Point of View: Using the 'Alias GT' Method. 3.3 Details of E212 VoIP Roaming. 10.1 Pirate Techniques? 10.2 Seamless 'Free Roaming'? GSM-UMTS with SS7 VoIP Gateways. 10.3 Attracting the Visitors and Forcing Them to Roam Immediately in a Given VPLMN. 10.4 IMS, the all IP Network Architecture. 10.5 Making a 4G 'IP Call' to a Mobile. References and Further Reading. 11 Worked-out Examples. 11.1 Examples of Chapter 1. 11.2 Examples of Chapter 3: Roaming Hub with Several Point Codes. 11.3 Examples of Chapter 4. Index .