Intelligent Networks. John Anderson. Principles and ApplicaHons. The Institution of Electrical Engineers

Transcription

1 Intelligent Networks Principles and ApplicaHons John Anderson The Institution of Electrical Engineers

2 Contents Preface Acknowledgments Introduction to intelligent networks. The basics of intelligent networks.. Origins..2 Extracting the service logic..3 Interactive voice functions..4 The 'classical' IN architecture and its elements..5 Locating the 'intelligence'..6 What is an 'intelligent' network?..7 The role of international standards.2 Why did we need IN?.2. The commercial drivers.2.2 IN as a universal integrator 2 The foundations of IN 2. The service switching function 2.2 Triggering to remote service logic 2.2. Introduction to triggering Introduction to IN call models Trigger detection points Trigger types and trigger criteria Trigger tables Event detection points The CS- basic call state model Notification and response DP types Triggering dynamics The CS- feature interaction manager 2.3 Hosting and creating IN services 2.3. SCPsandSCFs IX xiii

3 vi Contents Service data considerations Multi-service SCPs Service logic execution environment (SLEE) Service creation environment Operational support systems for IN services SCP 'non-functional' requirements Future trends for SCPs The intelligent peripheral The Assist procedure for IP connections INAP (the intelligent network application protocol) ETSI Core INAP operations IN CS- implementation issues Core INAP as a compliance benchmark INAP implementations and feature interactions SSP data management 5 3 Signalling intelligence Introduction Common channel signalling - the beginning The layered signalling model The message transfer part Signalling management intelligence Telephony user part intelligence Basic call set-up The 'intelligence' aspects of basic calls Further 'switch-based' intelligence SS7 signalling for IN Signalling connection control part (SCCP) Global title addressing Transaction capabilities application part (TCAP) Signalling differences between PSTN and GSM networks 68 4 Internationa/ standards for intelligent networking 7 4. Introduction Early US standards for IN ' INWATS, IN/ and IN/ AIN ITU-T IN CS IN CS- documents IN 'benchmark' services The IN conceptual model ETSI Core INAP and CS-R IN and mobile systems The role of IN with GSM CAMEL CAMEL Phase CAMEL Phase 2 89

4 Contents vii Future CAMEL phases Wireless intelligent networking (WIN) ITU-T IN CS Extra functions provided in CS Service plane for IN CS Global functional plane for IN CS CS-2 distributed functional plane IN CS-2 documents Physical plane for IN CS ITU-T IN CS IN CS-3 documents ITU-T IN CS Alliance between IN and Internet telephony Interworking between CS-4 and other networks Service application gateway function Service control gateway function CS-4 service features IN CS-4 documents 0 5 Call party handling Introduction Early 'leg control' network functions The CS-2 call model Legs and connection points CS-2 core switch capabilities The connection view model states Information flows supporting CPH Call party handling - A renewal of IN? 6 6 Distributed intelligence 9 6. Distribution of intelligence for network efficiency Distribution of intelligence across open network interfaces A model for distributed IN Infrastructure APIs Object request brokers for network intelligence The Parlay API Background What is the Parlay API? Parlay specifications TINA TINA roles and reference points The TINA architecture TINA specifications Relationship between IN and TINA 37 7 Service examples Simple number translations - Freephone service Inter-network Freephone 4

5 viii Contents 7..2 More complex number translations - Geographical routing Personal numbering Incoming call screening Least cost routing A virtual private network (VPN) service example A directory enquiry call completion service IN distribution of operator calls Automated response and call completion service Call completion service summary Call gapping Activate service filtering Simple CTI (computer-telephony integration) CAMEL calls An outgoing CAMEL call An incoming CAMEL call Pre-pay mobile service IN control for Internet dial-up access 65 8 Concluding summary IN today - How did we get here? Financial justification Vendor control Legacy switch-based features Tomorrow's intelligent network Future services 70 References 73 Appendix : List of ITU-T IN documents 77 Appendix 2: Additional CS- INAP operations 79 Appendix 3: Example SS7 message sequence coding 8 Glossary 205