pdf_gross.gifThe IP Multimedia Subsystem (IMS) -
Architecture Details & System Engineering

[3-day course, Euro 3,450.- (net) per participant]

backtotop.gifThe Service and Business Perspective of the IMS
(IP Multimedia Subsystem)

Course Description

  • The IMS enables the Multimedia Marketplace
    Positioning of the IMS, Differentiation of Service Delivery Platform and IMS, Presentation of typical Application Servers (OSA, PoC, …)
  • Why is the IMS needed?
    Standardized Realization of Charging, Roaming, QoS and Service Integration, IMS Use outside 3GPP
  • The Business Case behind the IMS
    What are Triple Play Services?, Competition by Cable-TV and fixed line operators
  • How to introduce the IMS
    Phased Approach, from non-real-time services to real-time services
  • Service Examples
    Multimedia Group or Broadcast Calls, Clearing Services, Presence Services, Gaming Services, GTT (Global Text and Total Conversation), Instant Messaging, Home Monitoring, White Board Communication, Push-to-Video (“see what I see”), …
  • Use Cases
    High level view on session setup and release, SIP involvement, Replacement of the circuit-switched core network domain

backtotop.gifComponents / Architecture of the IMS

  • X-CSCF
    Overview P-CSCF, I-CSCF, S-CSCF, the genuine SIP-Proxy and SIP-Registrar, Tasks and Functions, Operation Examples, PDF (Policy Decision Function)
  • BGCF and MGCF
    Overview, Tasks and Functions, Operation Examples
  • MRFC and MRFP
    Overview, Tasks and Functions, Operation Examples
  • Media Gateways
    Soft Switch Operation, Interworking with IMS-Controllers (MGCF)
  • The HSS (Home Subscriber Server)
    Information is stored in the HSS, Operation of SGW’s, Private and Public User Identities, the ISIM, Security Associations, information exchange over the Cx- and Dx-Interfaces
  • Related Network Elements
    SLF (Subscriber Locator Function), ENUM-Server, DiffServ-Routers, SEG (Security Gateways), Interworking with the packet-switched core network domain.
  • Application Servers
    Gaming, Presence, …, Architecture and Details of the ISC-Interfaces, OSA-Servers, involvement of .net and other environments for application development

backtotop.gifThe Protocol Suite of the IMS

  • Overview
    SIP, SDP, COPS, DBP, H.248 (MEGACO), RSVP, RTP, RTCP, Position in the Protocol Stack, Default Port Numbers
  • SIP and SDP
    Tasks and Functions, SIP-Method Types, important SDP-Descriptors, Functional Examples
  • RTP and RTCP
    Tasks and Functions, Codec Types, important SDP-Descriptors, Functional Examples

backtotop.gifTypical Use Scenarios

  • Application Level Registration
    Overview, P-CSCF-Discovery Procedure, SIP-Registration, S-CSCF-Assignment, Applicability of this Procedure, Message Flow
  • Multimedia Session Setup and Release
    Overview, QoS-Policing, Invocation of Authentication and Encryption, Codec Selection, Applicability of this Procedure, Message Flow, Charging Options

backtotop.gifFocusing on Advanced Issues: Security, QoS,...

  • QoS-Control in the IMS
    QoS-Authorization, SBLP (Service Based Local Policy), Function of the PDF, COPS-Involvement, Bearer Assignment, DiffServIntServ / Packet Inspection
  • Security Mechanisms in the IMS
    Security Concept, SPD and SAD, IMS-AKA, SIM-AKA, Profiling of IPsec for the IMS, Authentication Vectors, Authentication Scenarios, Integrity Protection, Assignment of SA’s, Involvement of SEG’s,
  • Roaming Scenarios
    Registration in a visited PLMN, S-CSCF Allocation, Charging