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SIP in IMS
SIP in IMS course description
The IP Multimedia Core Network Subsystem (IMS) is defined by 3GPP as a new mobile infrastructure. This advanced course looks at the use of SIP in the IMS.

Who will benefit?
Technical telecommunications staff.

SIP in IMS prerequisites
SIP for engineers.

SIP in IMS course objectives
By the end of the course delegates will be able to:
  • Describe the role of SIP in the IMS.
  • Explain how SIP works in the IMS
  • Describe the SIP architecture in the IMS.
  • Explain how SIP and SDP are used in basic IMS procedures.

Duration: 2 days



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SIP in IMS course contents

Introduction
SIP review, SIP elements, Simple SIP call flow, What is IMS? Why IMS? Why SIP in the IMS? SIP and IMS relationship.

Standards
3GPP, IETF, 3GPPr5, 3GPPr6, 3GPP SIP extensions.

SIP and IMS
IMS architecture, SIP interfaces.

Server functions
Registration, home and away, location and directory services, stateful and stateless servers.

SIP servers
P-CSCF, I-CSCF, S-CSCF, PSTN gateways

SIP registration in the IMS
SIP REGISTER, IMS identities, registration process, P-CSCF discovery, S-CSCF assignment, IMS subscriber and IMS registrar signalling flow. IMS routing in the registration process. Re and De-registration.

SIP sessions in the IMS
SIP INVITE, Establishing IMS SIP sessions, User at home network, user roaming, IMS offer answer architecture, SIP preconditions, QoS, reserving resources, IMS bearer network interactions, IMS subscriber and IMS service signalling flow. Typical call flows.

SIP services in the IMS
IMS specifications, IMS service procedures, call scenarios, call services. IMS multimedia related procedures. IMS presence, IMS messaging, IMS conferencing, IMS PoC.

SIP-T
SIP and the PSTN, URIs and ENUM, NAPTR, SRV, ISUP numbers and URI mapping, IAM and INVITE, SIP to PSTN/ISUP mapping, PSTN/ISUP to SIP mapping, PSTN to PSTN over SIP. MIME media types for ISUP, DTMF transmission, CLIP and CLIR in SIP, ring tone, split gateways

SIP-I
ISO standards, translation versus tunnelling.

IMS SIP extensions
Security (RFC 3310, 3329), Resource reservation (RFC 3312), Media authorisation (RFC 3313), SigComp (RFC 3320), P Headers (RFC 3325, 3455), Mobile registration (RFC 3327, 3608), Reg event (RFC 3680), Preconditions (RFC 4032)

Security
IMS security architecture, identities, HTTP digest, TLS. Affect of security on SIP media sessions.