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Essential HSPA and HSPA+  |    A 2 day training course

SIP in IMS training 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.

What will you learn
  • 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.
SIP in IMS training course details

SIP in IMS training 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.

Learning path



Based on overall ratings

O. B. - Network Rail

"Just one word “BRILLIANT."

L. S. - Arqiva

"Excellent handouts. I like that they are not PowerPoint slides."

Training approach

This structured course uses Instructor Led Training to provide the best possible learning experience. Small class sizes ensure students benefit from our engaging and interactive style of teaching with delegates encouraged to ask questions throughout the course. Quizzes follow each major section allowing checking of learning.