IMS and SIP Signalling with EPS and UMTS Access

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IMS and SIP Signalling with EPS and UMTS Access

ELP 4005  ★★★★   Public schedule

The course provides comprehensive understanding of the IMS architecture and presents interfaces and protocol stacks with their detailed description through functions and services they provide. The course contains analysis of several extensive examples of IMS signalling flows taken from a real network. The most important IMS procedures, such as registration and session initiation, are also discussed and presented on signalling diagrams. Each IMS service enabler (e.g. PoC, MMTel or Presence) is presented separately with its general description and from the perspective of SIP usage. The course also provides the explanation of basic concepts related to security, authentication, charging, Quality of Service and service provisioning. In addition the interworking between IMS, packed switched and circuit switched networks as well as cooperation of different IP versions is presented.

Target audience – Who should attend and benefit

The course is addressed to telecom professionals working with technical project management, product management, hardware and software design, system engineering, testing and verification, network planning, operations and maintenance and technical sales of IMS systems, products and services.

Prerequisites – What you are supposed to know prior to the course

General knowledge about mobile networks and networking concepts is recommended. For background knowledge participation in ELP 0306 IP in Mobile Backbone Network, ELP 0606 UMTS/WCDMA Advanced Overview and ELP 4002 LTE/SAE Overview is recommended.

Course contents – What you will learn

  • Network overview
    • Brief introduction to the evolution of mobile networks as well as the addresses and protocols used throughout the years
    • IMS voice codecs
  • Introduction to Voice over IP
    • Control plane protocols: SIP and SDP
    • User plane protocols: RTP and RTCP
    • Basic SIP concepts and nodes
    • CS breakout nodes: the MGC, MGW and BGCF
  • IMS architecture and basic concepts
    • From CS to PS networks
    • Architectural requirements
    • IMS layered architecture: service control layer, connectivity layer and service/application layer
    • Description of IMS entities and reference points
    • Identities, including ISIM, IMPI and IMPU
    • Usage of GRUU
    • Usage of SIP URI and tel URI
    • Basic SIP signalling flows: Registration and Session Initiation
  • SIP extensions used in IMS
    • Extending basic SIP – new methods and messages, e.g. P-Headers, 100rel, path, precondition, compression, privacy, sec-agree and preferences
    • DNS usage in SIP: SRV, NAPTR records and ENUM use
    • 3GPP extensions in use: IMS Register and IMS Invite signalling flows
    • The Diameter base protocol
    • Authentication and authorization in IMS
    • Service provisioning
  • IMS security
    • The IMS security architecture (SEG and NDS)
    • Overview of IMS authentication methods (NBA, GIBA, AKA, HTTP digest)
    • User privacy in IMS
  • Interworking
    • IMS – PSTN/CS interworking
    • IMS – IP/PS interworking and the concept of B2BUA
    • IPv6 and IPv4 interworking
    • The support for NAT in IMS
  • Policy and Charging Control
    • Charging architecture
    • Offline and online charging
    • Flow based charging
  • Quality of Service
    • The UMTS and EPS bearers and QoS
    • Mapping between QCI and QoS classes
    • Policy and Charging Control usage for QoS handling
  • Introduction to IMS services
    • Service provisioning architecture in IMS: the SIP methods Refer and Publish
    • Routing Public Service Identity
    • Voice Call Continuity
  • SIP usage in IMS services
    • Presence
    • Push to talk over Cellular
    • Messaging
    • Conferencing
    • Multimedia Telephony
    • Combinational Services

Duration – How long it takes

3 days which is equivalent to 18 hours of lecture.