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Agenda Corso IMS
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IMS CourseIMS CourseAgenda
04/10/23
IMS First ApproachIMS First Approach• IMS
o What is the IMSo Why IMSo Not only VoIP
• IMS Standardization o 3GPPo TISPANo GSMAo IETFo Open Mobile Alliance (OMA)
• IMS Architectureo HSSo CSCFo SBCo DNS/ENUMo ASo MGC/MGWo PCRFo IMS Identifierso Protocolso Interfaceso Interworking with existing networkso Interworking with access networks and devices
04/10/23
IMS going throughIMS going throughIMS & SIPoRequests and ResponsesoHeadersoSIP Message FlowoSDP introduction
IMS IdentifiersoThe User ProfileoPrivate IdentityoPublic IdentityoSIP URI /TEL URI FormatoInitial Filter Criteria (iFC)
04/10/23
IMS FlowsIMS FlowsIMS Call Flow Examples
o Registrationo Service Discoveryo IMS Authenticationo Service Triggerso Initial Filter Criteria Access and Location Information
• P-Access• P-Visited
o Controlling Bearer Traffic o Media negotiationo S-CSCF Managemento BGCF: Interworking with external network (PSTN/PLMN or IP Networks)o Application Serverso Third-Party Call Controlo Conferencing (REFER)o IMS Messaging (Immediate, Session-Based, Deferred)
04/10/23
..in the IMS domain ..in the IMS domain • Charging and IMS
o Charging Entities o Charging Functionso Interfaceso Protocols (Diameter)
• Securityo IPSECo Key Selection at Registrationo Security for Call Setupo Authenticationo Securing the Mediao Privacy and Identity
04/10/23
..in the IMS domain ..in the IMS domain • Presence
o SIMPLE - SIP for Instant Messaging and Presence Leveraging Extensionso Terminologyo Frameworko Resource List Manipulation Requirementso Authorization Policy Manipulationo Acceptance Policy Requirementso Notification Requirementso Content Requirementso General Requirements
• Subscriber Data structureo Subscribero Data Related to Mobile Station Typeso Data Related to Authentication and Cipheringo Data Related to Roamingo Data Related to Basic Services
04/10/23
Application ServersApplication Servers• AS Main function• AS Interfaces• TAS (Telephony Application Servers)• Supplementary services• Service Deployments
04/10/23
VoLTEVoLTE• Voice Over LTE• Architecture• IR 92 GSMA Specifications• Services• Terminals
04/10/23
Advanced ContentsAdvanced Contents
04/10/23
IMS Centralized IMS Centralized ServicesServices
• Network Evolution• IP based networks• Coesistence• Service Continuity• SCC AS• Call Flows• Interworking
04/10/23
VoLTE AdvancedVoLTE Advanced
04/10/23
• SR VCC• Architecture• 3GPP Rel 9 and 3GPP Rel 10• Call Flows• Network Impact
Access Device Access Device InterconnectionInterconnection
04/10/23
• SBC role in the Access Architecture• SBC as entry point in the IMS Network• IP Based Terminals• IP Based PBX• Integration with legacy PBX• Fax and POS interworking