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SIP – Session Initiation Protocol

Course Description

The Session Initiation Protocol - SIP was developed to create and handle multimedia sessions between different applications. Due to the inherit flexibility, combined with its simplicity and scalability, SIP was chosen by 3GPP as the protocol to be used for IMS.

The training Session Initiation Protocol – SIP, is a combines theory with exercises to cover both the fundamental and advanced features and functions of SIP.

The History of SIP, the protocol structure, the states and the more advanced functions and features such as messaging, SDP and security are explained.

Other topics covered are TCP/IP with related DNS, NAPTER, message forwarding and SIP session management.

Furthermore, SIP state handling, SIP extensions, SIP Security, the SIP services, and the use of SIP in the classic telephony and IMS are described.

Content

ORGANIZATIONS AND STANDARDIZATION
  • TCP/IP and Internet History
  • Internet standardization bodies, 3GPP & IETF
  • IETF Workgroups
SIP INTRODUCTION
  • SIP History
  • Voice over IP connection
  • IP Network Overview
  • SMTP & HTTP
  • Traffic case: Voice over IP
  • SIP - Components
  • METHODs and Responses
  • Basic Call Handling: REGISTRATION, INVITATION
  • Syntax of a SIP Message
  • SDP
  • SIP CANCEL
  • Forking Proxies
  • SIP Addressing
  • SIP Services
  • IP Tunneling
SIP ADDRESSING AND REGISTRATION
  • SIP Addresses and URI
  • Registration
  • Multiple Registrations
  • Registration in- and output
  • Reusing addresses
TCP/UDP/SCTP, DNS AND NAPTER
  • TCP/IP Protocol Stack
  • TCP/IP Encapsulation Process
  • IHL and Total length - Example
  • TCP
  • SCTP
  • TCP vs. UDP
  • UDP, TCP or SCTP
  • Introduction Domain Name System
  • Specific Domain Names and FQDNs
  • Records used in EPC
  • DNS on IPX/GRX
  • NAPTR
  • SRV – Service Record
  • Address Record
SIP MESSAGE FORWARDING
  • To the Destination
  • Selecting Transport Protocol
  • Selecting IP Address
  • SIP Transport Issues
  • The Via headers – Sent By – received
  • Simple Loop Detection
  • Special Loops
  • Forcing traffic a certain way
  • Recording PATHs
SIP SESSION MANAGEMENT
  • SIP Methods
  • SIP Extensions
  • SIP – Response Codes, Definitions & Examples
  • Important rules
  • Session setup - SDP Usage
  • An Offer/Answer Model with the SDP
  • Recording Routes
  • Session Modifying
  • Dialogs Creation, State
SIP STATE HANDLING
  • A scalable network architecture
  • Stateful or Stateless
  • Transaction Lifetime
  • Transaction Identification
  • Responses and Transaction state
  • 2xx  and 3++ Responses to INVITE
  • Forking Proxies
  • Stateful Cancel and 3++
  • Proxy core - Response handling, forking
  • Waiting and Selecting
  • INVITE & Non-INVITE Transactions
  • SIP Timers
  • Usefulness of 408 Responses
  • Recovering from packet loss
  • Rules and Exceptions
SIP PROTOCOL EXTENSIONS AND UPDATES
  • Extending the Protocol
  • Requiring Extensions
  • Request-Disposition
  • Callee Capabilities
  • Callee Preferences
  • SIP, SDP and Quality of Service
  • Provisional responses and Reliability
  • Reliable Provisional Responses
  • Provisional Response ACK
  • Early Media and Forking
  • Session Timer
SIP SECURITY
  • SIP and Firewall
  • N.A.T & P.A.T Basics
  • Implementation issues
  • Network Address Translation
  • STUN and TURN
  • Interactive Connectivity Establishment
  • Symmetrical (SIP) Responses
  • Client Initiated Connections in SIP
  • Securing SIP signalling
  • Authentication Digest
  • Privacy and Identification
  • S/MIME
SIP SERVICES
  • SIP - Service Creation
  • Call Processing Language
  • Some useful headers
  • SIP and call-transfer
  • Globally Routable User-Agent URI
  • 3rd Party Call Control
  • Replacing sessions
  • Call transfer - Attended
  • Events
  • Presence
  • Instant Messaging
  • Back 2 Back User Agent
  • Handling DTMF in SIP
  • URI ListsUMTS security model
CLASSIC TELEPHONY USING SIP
  • SIP and PSTN
  • Phone numbers vs. Sip-URI's
  • E.164 Number Mapping (ENUM)
  • SIP and PSTN
  • IP Multimedia Subsystem
  • SIP group (SiPiT)
  • Open Source Developments
  • Tools
  • Simple SIP Checklist
  • SIP Swiss Army Knife
  • SIP Scenario Generators
IP MULTIMEDIA SUBSYSTEM (IMS)
  • IMS Introduction
  • Why IMS?
  • Mobile Network
  • Protocol stack
  • PSTN Breakout
  • Public and Private IMS Identities
  • IMS- Service Profile
  • Traffic Case: IMS Invitation
  • IMS Registration & De-registration
  • WM-Map: IMS Registration & Invitation
  • IPSec and its procedures

 

    INTRODUCTION TO INFORMATION SECURITY

    Target audience

    The target group for this course are software developers, software testing engineers, multimedia operators, developers and other personnel working with either fixed or mobile networks and who need in-depth technical knowledge about SIP.

    Pre-requisites

    It is recommended that the participants have a basic understanding of data- and telecom, TCP/IP and Voice over IP.

    Course length

    3 days

    Price

    1.900 €

    Code

    WM0112-A

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