Understanding MultiService Access and SIP

A two-day workshop on Multiservice access using PPPoE/PPPoA/VLANs and SIP. The next generation of telecommunications networks will be deployed using VoIP technology and soft switching replacing circuit switching and ISDN signalling. By deploying communications as multimedia streams over IP it is possible to extend the services from simple voice to improved voice quality, better bandwidth utilization and expanded services into video and television carried over the same technology.

Already cost effective VoIP services have been deployed using H.323 and SIP over Intranet infrastructures. However to integrate this with existing ISDN and SS7 architectures and eventually to replace local exchanges and transit exchanges in carrier networks requires large scale signalling and switching changes. SIP-T or MEGACO can be deployed to achieve this.

The next generation of telecommunications networks is likely to use IP and for efficient and high-speed quality of service switching deploy MPLS to select routes.

This course will provide an intensive study of these technologies.


When you have completed this course you will be able to:

  • Describe how PPPoA functions today
  • Migrate access to PPPoE and VLAN operation with Gigabit Ethernet
  • Discuss the mechanisms used to carry voice over IP
  • Compare SIP, H.323 and Media Gateway Control Protocol
  • Employ SIP to build soft switched multiservice Environments
  • Analyse SIP, SIP-T and MGCP protocol exchanges
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Introduction To Next Generation Architecture (7 topics)

  • Current generation switching
  • Next generation IP Infrastructure
  • Access with PPPoA and PPPoE
  • Switch Control protocols and interfaces
  • Switching Control: General Switch Management
  • Switching Function: MPLS and CES
  • Gateway Control : SIP-T/MEGACO/H.248

Gigabit Ethernet and VLANs (10 topics)

  • Evolution of Ethernet
  • CSMA/CD and its replacement by Switching
  • Layer 1 presentations
  • Concept of a LAN and a VLAN
  • Bridging: 802.1d
  • Spanning Tree Delays
  • Proprietary extensions: PortFast
  • VLAN Trunking
  • 801.1Q
  • Selection of VLAN Identifiers

PPPoE Fundamentals (22 topics)

  • PPPoE/PPPoA Advantages and disadvantages
  • PPPoA operation recap
  • RFC1483
  • SNAP
  • OUI
  • Selecting bridging and routing protocols
  • VC selection by protocol
  • PPPoE Architecture
  • RFC2364/2516
  • Aggregation and links to service provision
  • IPCP and LPC peers
  • Linking to Service Providers
  • L2TP and other service provision
  • Maximum receiver unit considerations
  • PPPoE Active Discovery Initiation (PADI)
  • PPPoE Active Discovery Offer (PADO)
  • PPPoE Active Discovery Request (PADR)
  • Active Discovery Session-confirmation (PADS)
  • PPPoE Active Discovery Terminate (PADT)
  • PPP Session Stage
  • LCP Considerations
  • Security Considerations

Precedence and Quality of Service (9 topics)

  • Mechanisms for QoS
  • Layer 3:
  • RSVP
  • DiffServ
  • MPLS
  • MPLS experimental Bits
  • Layer 2: 802.1P
  • Bits in shim header
  • Delivering QoS

Carrying Multimedia Conferences over IP (11 topics)

  • Voice over IP Concepts
  • Control Plane
  • Information Plane
  • Signalling functions
  • RTP
  • CODECs and Encoding Media
  • RTCP
  • Session Description Protocol
  • Defining media streams
  • Architecture of a Soft Switch

Session Initiation Protocol (17 topics)

  • SIP standards and versions
  • Components of SIP based Multiservice Network
  • Registrar and Proxy Services
  • SIP Protocol Headers
  • Negotiating Capabilities and services
  • Location Services
  • Controlling SIP Gateways
  • Setting up a call
  • Ringing the line and connection the call
  • Terminating a connection
  • Negotiating the codec
  • SIP Proxy Interactions
  • Discovering SIP Servers
  • SIP Gateway Interaction
  • SIP-T and Bearer Independent Call Control
  • Telephone Routing over IP (TRIP)
  • Comparing SIP with Media Gateway Control Protocol (MGCP)

Analyzing Call Traces of SIP and MGCP Call Flows (5 topics)

  • Call between two residential gateways
  • Call from a business phone
  • Supplementary Service
  • Call Transfer
  • Call Waiting

A basic knowledge of IP, LANs, WANs, and data networks will be assumed. The necessary IP skills can be gained by attending the following course Hands On TCP/IP and Internet Protocols. The Comptia N+, or Cisco CCNA also meet the prerequisites.