TOP LOC 1806 Design and Structure of VoIP Networks


You will know the basics on packet-oriented speech transmission including components, interfaces, protocols and procedures.


Technical staff from

  • Enterprise networks responsible for network integration, operation and maintenance
  • Infrastructure and terminal equipment suppliers
  • Software companies and measurement suppliers responsible for development, production, quality monitoring, service and documentation


IT Basics


You will know the basics on packet-oriented speech transmission including components, interfaces, protocols and procedures.You will have a basic awareness for QoS problems and their solutions. Thus you will be able to develop, produce or manage your VoIP product or service with more competence and efficiency.


Design and Structure of VoIP Networks is an instructor lead course incl. practical excersises.


Introduction to Voice over IP

  • The Voice over IP Concept
  • Advantages of IP-Telephony
  • Worries about IP-Telephony

Voice over IP network

  • Network Elements
  • Single-Site /Multi-Site VoIP Location
  • VoIP and ISP

Speech Transmission

  • From analogue to digital speech transmission
  • Basic standards for audio coding
  • Mean Opinion Score
  • G.711 / G.723.1 / G.729 audio codecs
  • Codec - bandwidth - delay
  • Voice Activity Detection
  • Echo Cancellation

H323 Components

  • H.323 terminals
  • Software IP phones
  • Hardware IP phone
  • Gatekeeper
  • Gateway
  • MCU

H.323 Protocol suite

  • H.225 RAS Control
  • H.225 Q.931 call signaling
  • H.245 call control signaling
  • Audio and video codecs
  • T.120
  • RTP
  • H.235 security
  • H.450 Supplementary Services
  • H.246 translation function
  • H.323 over IP based networks

Basic Procedures

  • RAS-Signaling
  • Gatekeeper discovery
  • Gatekeeper registration and deregistration
  • Permission for calling
  • Call signaling
  • Direct Endpoint Call Signaling
  • Gatekeeper Routed Call Signaling
  • Call Control Signaling H.245
  • Status information
  • Bandwidth control
  • Fast-Connect procedures
  • Media transport with RTP
  • The RTCP protocol
  • RTP and RTCP
  • cRTP
  • Call release

Quality of Service

  • End-to-end delay
  • Jitter
  • Loss of package
  • Introduction to QoS
  • IEEE 802.1p/Q
  • IP Precedence
  • Diffserv
  • Layer 4 Switching
  • Resource Reservation Protocol
  • Queuing
  • Priority Queuing
  • Weighted-Fair-Queuing
  • Fragmenting
  • IP-MTU Fragmenting
  • PPP Multilink

Session Initiation Protocol (SIP)

  • Introduction
  • Addressing
  • Determining a SIP Servers
  • SIP transactions
  • SIP Call signaling
  • Location Server
  • SIP in proxy mode
  • SIP in redirect mode
  • SIP in comparison to H.323

IP-PBX Implementation Example

  • Components
  • Networking via IP
  • PBX migration staratgies towards VoIP


5 days


Dates on request


Mitel Certification