Training Course

Understanding Telecoms, Networking, IP, VoIP and SIP

  • 306
  • £3,395 +VAT
  • 5 days

Why this Telecoms, IP and VoIP course?

This unique course provides an essential and authoritative coverage of modern networks and telecommunications systems, including voice, data, TCP/IP, IPv6 networks and Voice over IP (VoIP). Attendees gain a solid foundation in a broad spectrum of current networking technologies through focussed lecture sessions, lab exercises and in-class demonstrations. Comprehensive reference materials reinforce the subjects covered during the course.

Telecoms, IP and VoIP Training Course Objectives

On completing this course, you will be able to:

  • Demonstrate a solid foundation in the broad spectrum of networking technologies that are essential for today’s network and IT professionals.
  • Demonstrate a knowledge of key Telecoms, Networking, IP, VoIP and SIP technologies.
  • Apply practical skills acquired through focussed lab exercises using with high-speed LANs, TCP/IP protocols, DHCP, DNS, IP routers, voice over IP products, IPv6 software, protocol analysers and more.

Who should attend this Telecoms, IP and VoIP course

  • All Network support staff, regardless of the types of networks they support.
  • All Telecommunications engineers – as a foundation for follow-on training, and also to “fill the gaps” in their areas of expertise.
  • Systems support staff wanting a comprehensive grounding in modern telecommunications and networking technologies.
  • Anyone needing a comprehensive introduction to modern telecommunications and data network technologies.

Telecoms, IP and VoIP Course Pre-requisites

Course attendees will ideally have some prior experience in the Telecoms or IT Industries.

Hands-on Practicals

Delegates gain hands-on practical experience with:

  • High-speed LANs
  • TCP/IP protocols
  • Wireshark Protocol Analysis
  • DHCP
  • DNS
  • IP routers (including Cisco)
  • Voice over IP products
  • IPv6 on Windows and Cisco routers
  • Security firewalls
  • and much more.

A new series of in-class demos and hands-on practical exercises allow delegates to experience a wide range of modern network technologies first-hand.

Lifetime Post-Course Support

After completing this Telecoms, IP and VoIP training course, delegates receive lifetime post-training support from LEVER Technology Group, to help them apply the technologies and skills they have learned with us, to provide career-long support, and to ensure they are better equipped for their future roles in IT and networking.

Telecoms, IP and VoIP Training Course Content

The evolution of telecommunications

  • The PSTN, modems, digital links, ISDN, X.25
  • Advent of computing, IP, Frame Relay, SDH
  • PABXs, voice mail, ACD and other voice technologies
  • LANs, intranets, LAN components, cabling
  • Network Unification

Essential communications principles

  • Network topologies
  • Circuit-switched networks
  • Packet-switched networks
  • Bps versus Baud
  • Data rate, bandwidth, throughput, latency, jitter
  • Time Division Multiplexing (TDM)
  • Inverse multiplexing, bonding
  • Statistical Time Division (STDM)

Protocol architectures

  • The OSI 7-layer model
  • Common protocol architectures
  • Function of protocols and layered architectures
  • IEEE 802 standards model

Public telephony services

  • Public telephone network
  • Cellular mobile networks
  • Cable networks

Using modems

  • Modem functions
  • Asynchronous and synchronous modems
  • EIA-232, V.24, V.35
  • Modem standards

ISDN networks

  • ISDN Basic Rate, Primary Rate and Broad Band services
  • ISDN structure and terminology
  • ISDN and the OSI Model
  • I.430/I.431, layer 1 frames
  • I.441 ISDN layer 2 LAPD
  • The ISDN signalling interface
  • Q.931 signalling operation

WAN technologies

  • Private Circuits
  • T1/E1, T3/E3
  • Overview of Fibre Optic Networking
  • Wave Division Multiplexing (WDM)

Broadband Services and Digital Subscriber Line (DSL)

  • DSL Overview
  • Broadband Evolution and DSL data rates
  • Discrete MultiTone (DMT)
  • Types of DSL:
  • The Local Loop and BT
  • The anatomy of broadband
  • The role and typical functions of the DSLAM
  • MDF, HDF, DSLAM, Splitter
  • The CPE equipment
  • Local Loop Unbundling (LLU) options
  • BT LES
  • MSAN

What is Computer Networking?

  • Essentials concepts
  • Peer-to-peer
  • File transfer & sharing
  • Client-server, Thin client

Network Data Transmission

  • Network packets, frame types
  • Data transmission
  • Packet-switching concepts
  • Packets versus cells

Ethernet and Local Area Networks

  • IEEE 802 series standards
  • Ethernet characteristics
  • Frame formats (DIX, 802.3)
  • MAC addresseses: unicast, multicast, broadcast
  • 10BASET, 100BASETx, Gigabit Ethernet, Metro Ethernet
  • LAN Repeaters, Bridges
  • Spanning Tree (STAP)
  • Layer 2 switches
  • The role of Routers
  • Layer 3 switches
  • Metro Ethernet

Introduction to TCP/IP

  • The DARPA model
  • Role of IP, TCP, UDP, ICMP, ARP
  • Application protocols
  • IP address, subnet mask
  • Default gateway

IP Addressing

  • Class A, B, C, D, E
  • What is a subnet?
  • Subnet addressing
  • Choosing the mask
  • Defining subnet IDs
  • Supernetting
  • Common problems
  • Resolving IP and MAC addresses
  • ARP protocol & cache
  • The arp command
  • Common problems

IP Operation and Routing

  • The IP Header
  • Routing fundamentals
  • Direct vs Indirect routing
  • System routing tables
  • Next Hop
  • Metrics and reliability
  • Static vs dynamic routing
  • D-V protocols: RIP and RIP II
  • Link State: OSPF, ISIS
  • The Autonomous System
  • Border Gateway Protocol, BGP
  • Exterior BGP
  • Interior BGP
  • BGP neighboring and peering
  • BGP Paths


  • DHCP Lease mechanism
  • DHCP Operation
  • Configuring scopes & options

Name Resolution

  • IP naming schemes
  • Configuring the HOSTS file
  • DNS Structure
  • DNS Principles
  • DNS Record Types
  • DNS Operation
  • Common problems

Ports, TCP and UDP

  • Port concept
  • UDP operation
  • TCP operation
  • TCP handshake
  • TCP data transmission and windows
  • Closing a TCP session


  • Principles of NAT
  • Basic NAT
  • NAPT/Overloaded NAT

Overview of IPv6

  • Need for IPv6
  • IPv6 Header
  • IPv6 Addressing
  • ICMPv6
  • IPv6 and NAT?

Overview of VoIP

  • Voice and data convergence
  • Components of a VoIP system
  • Standards employed in current VoIP solutions
  • The role of Voice Processing
  • The speech encoding process
  • Sampling, Quantisation, Coding, Framing
  • Silence suppression
  • Voice coding and compression standards
  • Adaptive encoding techniques
  • Coding fax signals
  • Voice codecs: G.711, G.722, G.721, G.723, G.726, G.723
  • Assessing voice quality
  • Mean Opinion Scores (MOS)
  • Detecting flaws in transmitted voice
  • Employing MOS ratings for codecs and real networks
  • Assessing Voice Quality
  • Measurable components
  • What to test and measure
  • P.800 / P.861 recommendations
  • PESQ

Operating Voice over IP

  • The issues when operating Voice over IP
  • Delay, Talker overlap, Echo
  • Jitter, Packet loss
  • Out of Order Delivery
  • The role of Voice Processing and DSP
  • Real-time Transport Protocol (RTP)
  • The role of RTP
  • RTP header in detail
  • RTP payload types
  • Real-time Transport Control Protocol (RTCP)
  • Conclusions

Introduction to Voice over IP signalling

  • Overview of signalling in PSTN networks
  • Overview of private network signalling
  • The major architectures and standards for Voice over IP
  • ITU H.323
  • MGCP and Megaco/H.248
  • Cisco SCCP (Skinny)
  • VOIP in the enterprise
  • VOIP in PSTN Emulation Service (PES)

ITU / IETF Megaco / H.248

  • MGCP and Megaco
  • The Media Gateway Reference Architecture
  • End-to-End call setup
  • IETF Megaco
  • Megaco Terminations and Contexts
  • Megaco Commands
  • Megaco Packages
  • Megaco IP phone Media Gateway

Overview of IP QoS

  • Classifying IP traffic
  • Review of the IPv4 Datagram format
  • IPv4 Service (TOS) field
  • Precedence bits
  • DTR(C) bits
  • Characteristics of RTP media flows
  • Classifying packets in IPv6 networks
  • The need for QoS
  • IP Differentiated Services (Diff-Serv)
  • Queuing and Scheduling mechanisms
  • First-In First-Out (FIFO), Strict priority scheduling, Fair Queuing, Weighted-Fair Queuing (WFQ), Class-Based Queuing, Hierarchical Class Based Queuing (CBQ)
  • Coping with packet loss
  • Controlling admission
  • Employing Random Early Detection
  • Employing traffic shaping
  • IEEE 802.1p/Q
  • Operating IP over ATM networks
  • Overview of MPLS

SIP Overview

  • SIP design requirements
  • The development of SIP
  • SIP and VOIP
  • SIP Vs. H.323 and H.248/MEGACO
  • What SIP does
    • SIP and Next Generation Networks, NGN
    • SIP and mobility
  • Why we would deploy SIP
  • The role of SIP within:
    • Mobile
    • Provider VOIP
    • NGN solutions
    • Unified Communications
    • Multimedia
    • SIP based contact centres and using SIP for contact centre hosting
    • SIP Trunking
    • Mini case studies

SIP Architecture and Components

  • SIP User Agents
  • SIP Registrar
  • SIP Proxies
  • SIP Location server
  • SIP Redirect Server
  • SIP Back to Back User Agent (B2BUA)

Overview of SIP Operation

  • The SIP User Agent client and server
  • The SIP URI
  • SIP Methods and Responses
  • SIP message exchange
    • SIP Messages involved setting up a simple SIP call
    • INVITE method
    • 100 Trying
    • 180 Ringing
    • 200 OK
    • ACK
    • BYE method
  • Overview of other widely used SIP messages
    • NOTIFY
    • INFO
    • PRACK

SDP Description and Role

  • Role of SDP
  • Structure of SDP
  • SDP operation

SIP Registration and Location Servers

  • Role of the SIP Registration Server
  • SIP Registration Method
  • SIP Registration/location to provide roaming/mobility

SIP Proxy

  • SIP Stateful Proxy
  • SIP Call Stateful Proxy
  • SIP Stateless Proxy
  • SIP Stateful/stateless proxies


  • Mapping E.164 dialled digits to SIP using DNS/ENUM
  • SIP and ENUM

The SIP Redirect Server

  • SIP REDIRECT methods
  • Using redirection to route calls
  • Using redirection to implement mobility
  • SIP redirection, proxies, registrars, and location services to provide mobility and roaming

Problems of SIP NAT Traversal

  • Common solutions to SIP NAT Traversal
  • Simple Traversal of UDP through NAT’s, STUN
  • Traversal using Relay NAT, TURN
  • Universal Plug and Play, UPnP
  • Tunnelling/VPN
  • Session Border Controller, SBC

SIP In the Cloud

  • SIP Gateways
  • SIP integration with the PSTN/ISDN
  • SIPI and SS7 ISUP
  • SIP and H.248/Megaco
  • SIP and H.225/H245/H.323
  • SIP and MPLS/QOS
  • SIP Trunking
  • Hosted SIP PBX
  • Hosted SIP Conferencing
  • Hosted SIP based contact centre

Potential threats to SIP

  • Registration Hijacking
  • Impersonating a Server
  • Tampering with Message Bodies
  • Tearing Down Sessions
  • Denial of Service and Amplification

Securing SIP

  • Transport and Network Layer Security
  • SIPS URI Scheme
  • SIP Method Authentication
  • Registration
  • Interdomain Requests
  • Peer-to-Peer Requests
  • DoS Protection
  • HTTP Digest
  • S/MIME
  • TLS

SIP Solutions and Capacity Planning

  • Design considerations when deploying SIP solutions
  • Feature requirements
    • Matching customer requirement to cloud offering
    • Identifying the Customer Premises Equipment (CPE) requirements
    • Server implementation
  • Security and resilience of SIP servers
  • Security to the Cloud
  • Interconnection and communication with other severs such as DNS, and RADIUS/DIAMETER

Connecting to the Cloud

  • SIP based VOIP Key Performance Indicators (KPI’s)
  • Sizing VOIP voice channel capacity
  • Impact of VOIP on data applications
  • Translating Erlangs and Grade of Service (GOS) into VOIP channel capacity
  • Impact of VOIP QOS on Grade of Service, GOS
  • Concept of Connection Admissions Control, CAC/VCAC
  • SIP and QOS
    • Possible QOS signalling within SIP
    • Enforcing the GOS from the SIP servers
  • Determining the bandwidth requirements for SIP signalling
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