QOS - State of the Market by r4NxxJ3V

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									Quality of Service – State of the Market
                Alan Percy
                Director of Business Development
                AudioCodes, Inc.
                Alan.percy@audiocodes.com
                Booth #822
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 OEM’s and TEM’s
 Key originator of ITU G.723.1 standard for VoIP
 Leader in Innovation and Density of VoIP
  Solutions
 Financially strong and stable
Background
                                         Consumer VoIP Subscribers
 Customer demand
  is building                       10

 VoBB carriers are                  8
  proliferating

                      in millions
                                     6
 What will
                                     4
  differentiate the
  carriers?                          2

                                     0
                                         '03   '04   '05          '06      '07     '08
                                                           Year         Source: In-Stat
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
New Carriers, New Challenges

Today: New Frontier
 Depending on existing broadband
      Cable
      DSL
      Fixed wireless
 New Wireless Services
      3G
      WiMax
      WiFi
      SAT
What have we learned?

You can’t always control the network
      To make the business model work, you sometimes need to
       leverage the existing infrastructure
What have we learned?

The last mile is the hardest mile!
What have we learned?

 Murphy’s 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”)
Is voice quality important?


     “Voice Quality is the most sensitive
       issue for business customers”
       Greg Schreiber, VP of Product Development - Vaspian
What affects voice quality?
Choosing the Right Coder
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
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
ETSI Test Setup
                                            Packet
                                            MONITOR
    Gateway                                                Gateway
                          NISTNet
                  IP                   IP         IP

                         Packet Loss
                         Delay

         E1                                               E1



                              PBX


          ISDN DSS1                             ISDN DSS1

                         HEAD acoustics
                       Test System ACQUA
          Input                                        Output
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
ETSI Test Result for 10 Gateways
                   P1




     P2    P3      P4




     P5    P6      P7




     P8    P9      P10
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
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
Thanks
                                    Come and meet us
                                      at the Keynote!
                                     Thursday @ 5:15

 Alan Percy
 Director of Business Development
 AudioCodes, Inc.
 Alan.percy@audiocodes.com
 Booth #822

								
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