SIP and the IMS (2 days or 12 hours)
Service Providers are currently in a transition phase within their networks, migrating from a predominantly circuit switched architecture to an end to end packet switched solution. This course defines the 3GPP IMS (IP Multimedia Subsystem) architecture, a service management network which relies on SIP to establish, maintain and terminate multimedia sessions across a variety of IP based access networks. This course will focus on the incentives for, the architecture behind and the overall operation of the IMS, including a detailed discussion on the use of SIP to facilitate this architecture.
Who Should Attend
Technical Staff involved in the development and deployment of next generation IMS networks. Network Engineers requiring a comprehensive explanation of IMS operation.
Pre - Learning
Pre-Learning is provided to prime those attending the instructor led phase. Each lesson is based on an interactive online format and should take about 30 minutes to complete. The pre-Learning lessons are:
- Packet Switching.
- Protocol Stacks and IP.
- IP Addressing.
- The IP Multimedia Subsystem.
Course Outline
Divided into 8 sections, the topics covered will include:
Section 1: IMS Concepts and Drivers (1.5 hours)
- Incentives for IMS - OPEX, CAPEX, ARPU.
- Convergence and Service Drivers.
- IMS Concepts - open systems interoperability, common control.
- IMS Key Features.
- IMS Services.
- IMS Standards and Alternatives - 3GPP, ETSI TISPAN, 3GPP2.
Section 2: IMS Architecture (2 hours)
- Positioning the IMS.
- IMS Key Requirements.
- IMS Control and User Plane.
- IMS Key Nodes - P-CSCF, I-CSCF, S-CSCF, HSS, AS.
- IMS Supporting Nodes - SLF, MRF, BGCF, IBCF, IM-ALG, TrGW, ISC and SCIM.
Section 3: Session Initiation Protocol (1.5 hours)
- SIP Capabilities.
- SIP Identities and Functional Elements - AoR, Proxy, Registrar, Redirect.
- Methods - Register, Invite, Ack, Cancel, Bye, Options.
- SIP Registration and Registration Security.
- SIP Session Establishment.
- Defining the Media Stream with SDP (Session Description Protocol).
- Where appropriate, network traces and associated exercises will feature throughout the section to enhance understanding.
Section 4: SIP Enhancements (1.5 hours)
- Development of SIP - SIP Working Groups, SIMPLE, SIPPING.
- Areas of Development - header fields, methods, warning codes, security mechanisms.
- Additional Methods - Publish, Subscribe, Notify, Prack, Info, Update, Message, Refer.
- Problems associated with Firewalls and NAT.
- NAT Traversal Techniques - UPnP, ICE, SBC.
Section 5: IMS Security (1.5 hours)
- IMS AKA.
- IMS AV Generation.
- Encryption, Authentication and Integrity Checking Process.
- IPSec - AH and ESP.
- Asserted Identities and Trust Relationships.
- Network Security Techniques - Firewalls, IPS, SBC etc.
Section 6: IMS Registration (1.5 hours)
- IMS Identities - ISIM, Private / Public User Identities, PSI.
- Implicit Registration.
- Service Profiles.
- IMS Registration Procedures.
- Where appropriate, network traces and associated exercises will feature throughout the section to enhance understanding.
Section 7: IMS Session Establishment (1 hour)
- Policy Control and Enforcement in the IMS - PCC, PCRF, PCEF.
- SDP Offer Answer Model.
- Preconditions.
- Session Establishment Procedures.
- IMS Charging Concepts - Online and Offline.
Section 8: IMS to Legacy Voice Interworking (1.5 hours)
- IMS to Legacy Voice Interworking Components - MGCF, MGW, BGCF, SIG.
- Softswitches and H.248.
- ENUM.
- IMS to PSTN Circuit Switched Procedures.
- PSTN to IMS Circuit Switched Procedures.
- Emergency Services Operation - E-CSCF.
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