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WBT VoIP Content

  • Modul 1: Introduction to Voice over IP
    • Telephone and data networks
    • The classic Telecommunication system and connections
    • The Voice over IP Concept
    • Advantages of IP-Telephony
    • Worries about IP-Telephony
    • Field of application of IP-PBXes
    • Test
       
  • Modul 2: Voice over IP network
    • Network Elements
    • Single-Site VoIP Location
    • Multi-Site VoIP Location
    • PBX Networking via IP
    • PBX Migration towards VoIP
    • VoIP and ISP
    • Test 
       
  • Modul 3: Speech Transmission 
    • Analogue Speech Transmission
    • Digital Speech Transmission
    • Basic Standards for Audio Coding
    • Mean Opinion Score
      • G.711
      • G.723.1
      • G.729
    • Codec and Bandwidth
    • Codec Bandwidth and Delay
    • Voice Activity Detection
    • Echo Cancellation 
    • Test
       
  • Modul 4: H323 Components
    • H.323 terminals
      • The software IP phone
      • The hardware IP phone
    • The Gatekeeper
      • Main functions of the gatekeeper
      • Additional functions of the gatekeeper
    • The H.323 gateway
    • The MCU
    • Test
       
  • Modul 5: H.323 standard
    • The 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
    • TEst
       
  • Modul 6: Signaling
    • The 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
    • Test
       
  • Modul 7: End-to-end delay
    • Delay in general
    • Jitter
    • Loss of package
    • Test
       
  • Modul 8: Quality of Service
    • 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
    • Test
       
  • Modul 9: 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
    • Test