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Can We Talk? Presented by Todd McIntire. Can We Talk?. IP Telephony (VoIP) Voice/Data Integration PC/Telephony Convergence. IP Telephony Basics. Data networks use TCP/IP Common protocol for disparate data networks Time-share approach to sharing data between asynchronous devices

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Can We Talk?Presented byTodd McIntire


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Can We Talk?

  • IP Telephony (VoIP)

  • Voice/Data Integration

  • PC/Telephony Convergence


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IP Telephony Basics

  • Data networks use TCP/IP

    • Common protocol for disparate data networks

    • Time-share approach to sharing data between asynchronous devices

    • Packets travel when the network is available

    • Networks have variability and latency

    • Effective for email, file transfer, web browsing

    • Not effective for real time voice, video


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IP Telephony Basics

  • Public Switched Telephone Networks

    • Dedicated circuit for each conversation

    • Analog voice signals are digitally encoded to cross public network then decoded back to analog at receiver

    • Digital packets must arrive at decoder in sequence and in regular increments of time

    • Latency and variability must be nearly zero for voice message to be intelligible


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Voice vs. Data Networks

  • Voice

    • Sound bytes and silence bytes created, accepted, multiplexed, switched, transported and delivered at the frequent, regular and precise pace of every 125ms.

  • Data

    • packets created whenever there's some data around and move through the network whenever it's available.


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Convergence—Voice over IP

  • Voice over IP (VoIP)

    • Must keep latency, variability and loss to a minimum

      • Use compression to reduce vulnerability to latency, variability and loss

      • Real-time Transport Protocol

        • Intelligent continuity algorithms at receiving decoder

        • Fill voids by stretching and blending voice packets


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Advantages of VoIP

  • Cost—VoIP cost half of PSTN; fewer lines

  • Simplicity—Carry voice and data over same network

  • Integration—Single workstation for PC and telephony

  • Unified Services—Single mailbox for voice, fax and email