QOS - State of the Market

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(No Transcript)
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Quality of Service State of the Market
Alan Percy Director of Business
Development AudioCodes, Inc. Alan.percy_at_audiocodes
.com Booth 822
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AudioCodes A VoIP Leader

• 13 Years of Operation Focusing on VoIP Media
  Gateway Media Server Technology
• Field proven technology Over 12 Million Channels
  shipped to over 100 Countries
• Enabling the VoIP leading OEMs and TEMs
• Key originator of ITU G.723.1 standard for VoIP
• Leader in Innovation and Density of VoIP
  Solutions
• Financially strong and stable

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Background

• Customer demand is building
• VoBB carriers are proliferating
• What will differentiate the carriers?

Source In-Stat
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New Carriers, New Challenges

• A few years ago, we equipment providers thought
  we had this figured out.
• Then
• Private networks
• Intra-Enterprise
• Carefully controlled (over-engineered) networks

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New Carriers, New Challenges

• Today New Frontier
• Depending on existing broadband
• Cable
• DSL
• Fixed wireless
• New Wireless Services
• 3G
• WiMax
• WiFi
• SAT

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What have we learned?

• You cant always control the network
• To make the business model work, you sometimes
  need to leverage the existing infrastructure

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What have we learned?

• The last mile is the hardest mile!

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What have we learned?

• Murphys law is true!
• (Poor voice quality will only affect the CEO
  during an important investor call)
• Poor voice quality will get you kicked out
• Huge variation in voice quality between equipment
  vendors
• (Especially when network conditions are not
  ideal)

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Is voice quality important?

• Voice Quality is the most sensitive issue for
  business customers Greg Schreiber, VP of
  Product Development - Vaspian

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What affects voice quality?
Packet Loss
Echo
Jitter
Latency
Quality
Comfort Noise
Coder
Voice Activity Detection
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Choosing the Right Coder
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Measuring Voice Quality

• Listening Speech Quality Scores
• Perceptual Evaluation of Speech Quality (PESQ)
• Automated using ITU recommendation P.862
• Range of voice coders
• Range of network impairments
• 0 5 Packet Loss
• Up to 20 msec Jitter
• Up to 100 msec additional delay
• Conversational Aspects
• Ability to deal with background noise, double
  speak and echo

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ETSI Speech Quality Test Event

• Sponsored by ETSI - Done by HEAD Acoustics Labs
• Has been held several times over the past three
  years
• VoIP equipment testing in controlled conditions
• Receive an objective and comparative analysis
• The tests include all conversational aspects,
  including
• Speech sound quality
• Echo measurements
• Double Talk performance
• Transmission quality in the presence of
  background noise
• Anonymous - Only your results are identified

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ETSI Test Setup
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ETSI results Summary

• Six conversational and six listening tests
• Ten gateways participated in 3rd SQTE
• The results for each gateway are summarized in a
  Pie Chart with a slice per each category
• The performance in each category was represented
  by the radius of the slice and by a color code
• Red the amount of which the results were under
  the requirement
• Yellow result was below the requirement if
  accompanied with red or OK if no red
• Green result was above the requirement

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ETSI Test Result for 10 Gateways
P1
P2 P3 P4
P5 P6 P7
P8 P9 P10
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Measuring Quality RTCP XR

• Real Time Control Protocol Extended Reports
• Embedded measurement tool
• Measuring Quality During the Call
• Packet Loss
• Delay
• Signal Quality
• Call Quality MOS and R Factor
• Reported in RTCP, SDP or via SNMP

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Improving Voice Quality

• Techniques vendors use to maximize quality
• Dynamic Jitter Buffer
• Adjusting to ever-changing network conditions
• Packet loss concealment
• All coders, including G.711
• Echo cancellation algorithms
• Double Speak
• VAD and CNG algorithms
• Extensive field and lab testing

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Thanks
Come and meet us at the Keynote! Thursday _at_ 515
Alan Percy Director of Business
Development AudioCodes, Inc. Alan.percy_at_audiocodes
.com Booth 822