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EncartaLabs

IP Multimedia Subsystem (IMS)

( Duration: 5 Days )

In IP Multimedia Subsystem (IMS) training course, you will begin by studying the systems surrounding the IMS to gain a clear vision of the big picture. Once you understand where the IMS fits into the PSTN, will study the IMS architecture through a process of lecture and hands-on training. You will learn key IMS protocols including SIP, SDP, H.248, COPS, and Diameter.

By attending IP Multimedia Subsystem (IMS) workshop, delegates will learn:

  • How IMS fits into the big picture
  • IMS architecture
  • IMS protocols SIP, Diameter, H.248, SDP, and COPs
  • SIP Uniform Resource Indicators (URIs)
  • IMS-related IP services
  • IMS call flow examples
  • IMS security
  • Instant messaging and presence

  • TCP/IP Networking
  • VoIP Protocol Essentials: SIP

COURSE AGENDA

1

The IMS Standards Bodies

  • 3GPP
  • 3GPP2
  • IETF
  • Open Mobile Alliance (OMA)
  • TISPAN and IETF
2

Accessing IMS with VoLTE

  • Interfaces Associated with EPC
  • E-UTRAN, EPC, and IMS
  • MME, SGW, and PGW
3

IMS for GPRS and CDMA2000

  • GSM vs. CDMA2000 3G Architecture Comparison
  • IMS and 4G Interoperation (IM and VOLTE)
  • IMS Connectivity into a CDMA2000 network (IM)
  • Migrating CDMA2000 to Support the IMS Using LTE Access
  • SIP Anchoring
4

IMS Architecture

  • Components
    • HSS
    • Proxy-CSCF
    • Serving CSCF
    • Interrogating-CSCF
    • Policy Decision Function
  • IMS Identifiers
  • IMS Message Paths Introduction (Via and Record-Route)
  • The Service Path
  • Initial Filter Criteria Introduction
5

SIP Architecture

  • Requests and Responses
  • SIP Message Flow
  • SDP introduction
6

IMS Service Path

  • The Service Path
  • Path Header (RFC 3327)
  • Service-Route (RFC 3608)
7

The Via Path

  • The Via: Header
  • Establishing the Response Path
  • Forking – Response Merging
  • Loops and Spirals
  • Max Forwards
8

The Route Path

  • Route Path vs. Via Path
  • Record-Route and Route Headers
  • Establishing the Route Path
  • The Role of the S, I, and P Proxies
9

IMS Identifiers

  • IMSI
  • UICC
  • Home Network, Public ID, Private ID
  • SIP IRU Format
10

Initial Filter Criteria (iFC)

  • The User Profile
  • How the iFC is Used
  • Understanding XML
  • Disjunctive and Conjunctive Normal Form
11

IMS Reference Points

  • Gm, Mw, Cx, Dx, Sh, Si, Dh, Mm, Mg, Mi, Mj, Mk, Ut, Mr, Mp, Go, Gq, ISC
  • Specific analysis of the Cx and Dx interfaces
  • DIAMETER
12

DIAMETER

  • DIAMETER vs. RADIUS
  • AVPs
  • SCTP vs. TCP
  • IMS Command Values
  • IMS DIAMETER Example
13

SIP Headers (Basic)

  • Via, Branch, Max-Forwards
  • SIP Dialog (To, From, tag=fields, Call-ID:)
  • CSeq, Contact: Expires:
  • Proxy-Authentication:, Proxy-Authorize:
  • User-Agent:, Allow:, Supported:
  • Content-Type:, Content-Length:
14

IMS SIP Headers (Advanced)

  • P-Access-Network-Info
  • P-Charging-Vector:, P-Preferred-Identity:, P-Asserted-Identity:, Authorization:
  • Security-Client:, Security-Server:
  • IMS Signaling Compression (SigComp Architecture)
15

Session Description Protocol (SDP)

  • Session Parameters
  • SDP Format
  • Extending SDP
  • SDPng
  • Media Negotiation
  • Changing Session Parameters
16

SIP Timers

  • T1, T2, T4
  • Timers A-K
17

IMS QoS Management

  • IMS QoS Info Exchange During Call Setup
  • New SDP Fields (RFC 3312)
  • COPS Integration
18

IMS and the DNS

  • DNS Basics
    • A-Record
    • The SRV Record (RFC2782)
    • How SIP uses the SRV Record (RFC3263 Locating SIP Servers)
    • How to Configure a SRV Record
    • The NAPTR Record (RFC2915)
  • How the P-CSCF Locates the I-CSCF
  • Introduction to ENUM (RFC3761: ENUM Protocol)
  • How the S-CSCF uses ENUM
19

IMS Call Flow Examples

  • Registration
  • Service Discovery
  • Identity Modules
  • IMS Authentication and Key Agreement (User Identities)
  • Service Triggers
  • Initial Filter Criteria
  • Network Domain Security
  • Secure HTTP-Based Service
  • Controlling Bearer Traffic
  • Controlling the Media
  • Anonymous Calling (Hide Caller ID)
  • S-CSCF Assignment Processes
  • MEGACO and SIP-Controlled PSTN Connectivity
  • Creation of via-path for Response Routing
  • Response Merging
  • Control Models
  • Role and Functions of HSS
  • Third-Party Call Control
  • Conferencing (REFER)
  • Access and Location Information
    • P-Access
    • P-Visited
  • IMS Messaging (Immediate, Session-Based, Deferred)
20

Charging and IMS

  • Charging Entities and Function
  • P-Headers Related to Charging
  • Diameter and How It’s Used for Ro Interface
21

Security

  • IPSEC
  • Key Selection at Registration
  • Security for Call Setup
  • Authentication
  • Securing the Media
  • Privacy and Identity
22

Presence

  • SIMPLE – SIP for Instant Messaging and Presence Leveraging Extensions
  • Terminology
  • Framework
  • Resource List Manipulation Requirements
  • Authorization Policy Manipulation
  • Acceptance Policy Requirements
  • Notification Requirements
  • Content Requirements
  • General Requirements
23

Organization of Subscriber Data

  • Subscriber
  • Data Related to Mobile Station Types
  • Data Related to Authentication and Ciphering
  • Data Related to Roaming
  • Data Related to Basic Services

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  • Get jumpstarted from newbie to production ready in a matter of few days
  • Trained more than 50,000 Corporate executives across the Globe
  • All our trainings are conducted in workshop mode with more focus on hands-on sessions

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Contact us for delivering this course as a public/open-house workshop/online training for a group of 10+ candidates.

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