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IP TELEPHONY Voice over IP (VoIP). What is IP Telephony?. Compression to less than 32Kbps. Transfers through Routers, LAN Switches etc, using their Protocols. VoIP Placement. Telephone Replacement IPHONE, Ethernet Phone Transmission Substitution Tie Line, Trunk, Loop

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Ip telephony voice over ip voip l.jpg

IP TELEPHONYVoice over IP (VoIP)


What is ip telephony l.jpg
What is IP Telephony?

Compression to less than 32Kbps

Transfers through Routers,

LAN Switches etc, using their Protocols


Voip placement l.jpg
VoIP Placement

  • Telephone Replacement

    • IPHONE, Ethernet Phone

  • Transmission Substitution

    • Tie Line, Trunk, Loop

  • Switching Alternatives

    • PBX, CO, CENTREX


  • Convergence l.jpg
    “Convergence”

    • Adding Voice, Video, Fax to Data Network

    • Unified Messaging

    • Centralized Communication Services

      • Email, Telephony, Multi-media

  • Common Protocol (IP)


  • Voice to from ip l.jpg
    Voice To/From IP

    Voice

    Analog

    CODEC: Analog to Digital

    Compress

    Create Voice Datagram

    Add Header

    (RTP, UDP, IP, etc)

    Digital


    Voice to from ip6 l.jpg
    Voice To/From IP

    Digital

    Process Header

    Re-sequence and

    Buffer Delay

    Decompress

    CODEC: Digital to Analog

    Analog

    Voice


    Traditional network characteristics l.jpg

    Dedicated Point-to-point

    Short/Constant Delay

    No Retransmission

    Low Error Tolerance

    Direct Pass Through

    Mainly connectionless

    Variable Delay

    Packet Loss

    Retransmission

    Uses protocols

    Traditional Network Characteristics

    Voice

    Data


    Packet network technologies l.jpg
    Packet Network Technologies

    Same Components

    Different Performance

    An Intranet

    • Routing (TCP/IP)

    • Frame Relay

    • ATM

    • MPLS

    • Routing (TCP/IP)

    • Frame Relay

    • ATM

    • MPLS


    Voice over ip networks l.jpg
    Voice Over IP Networks

    VPN

    An Intranet

    • Subscribed

    • Environment

    • No Control except SLA

    • No Guarantees

    • Controlled

    • Environment

    • Performance Objectives

    • Designed to perform

    VPN: Virtual Private Networks


    Voice over ip requirements l.jpg

    Compression

    Reduced bps vs. Quality

    Silence Suppression

    Assumptions

    Signaling

    Functions

    Speed

    Echo Control

    Local

    Quality of Service (QoS)

    Toll quality

    Voice Enhancements

    Directory services

    Feature: CLID, Call waiting

    Voice Over IP Requirements


    Ip pbx lan pbx l.jpg
    IP PBX (LAN PBX)

    LAN PHONES

    GATEKEEPER: VIRTUAL PBX (SERVER BASED PBX)

    GATEWAY: EXTERNAL ACCESS CONNECTOR

    MCU: MULTIPOINT CONTROL UNIT (Conf. Call, 3 or more units)


    Technical issues l.jpg
    Technical Issues

    • 64 Kbps or Compressed Voice

      • Standard or Proprietary

  • Network Size

  • Cable Distance (100m)

  • Operation Through LAN Switches

  • VoLAN or VoIP over LAN/WAN

  • Desktop Requirements

  • Global VoIP Standards


  • Slide13 l.jpg

    Voice Over IP Building Blocks

    Voice

    IP

    Protocol

    Network

    Regulatory

    Protocol

    Standards

    Performance

    Stanndards

    Standard

    Jitter

    Speech

    Coding

    IP

    Delay

    Access

    UDP

    Fees

    Call Control

    congestion

    TCP

    Separation

    SIP

    Network

    Payments

    RTP

    packetiza-

    tion

    Interface

    RTCP


    Slide14 l.jpg

    H.323 Protocol Stack*

    Call Control

    Audio

    Video

    A/V Control

    Data

    G.7xx

    H.26x

    H.225

    SIP

    H.245

    T.120

    RTCP

    RAS

    Q.931

    RTP

    TCP

    UDP

    IP

    *SIP – Session Initiation Protocol is an alternative to H.323


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