Ims course

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