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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
Can We Talk?
  • IP Telephony (VoIP)
  • Voice/Data Integration
  • PC/Telephony Convergence
ip telephony basics
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
ip telephony basics4
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
voice vs data networks
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.
convergence voice over ip
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
advantages of voip
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