Quality of Service – State of the Market

2. Quality of Service – State of the Market Alan Percy Director of Business Development AudioCodes, Inc. Alan.percy@audiocodes.com Booth #822

3. 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 ITUG.723.1 standard for VoIP • Leader in Innovation and Density of VoIP Solutions • Financially strong and stable

4. Background • Customer demand is building • VoBB carriers are proliferating • What will differentiate the carriers? Source: In-Stat

5. 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

6. New Carriers, New Challenges Today: New Frontier • Depending on existing broadband • Cable • DSL • Fixed wireless • New Wireless Services • 3G • WiMax • WiFi • SAT

7. 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

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

9. 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”)

10. Is voice quality important? “Voice Quality is the most sensitive issue for business customers” Greg Schreiber, VP of Product Development - Vaspian

11. What affects voice quality? Packet Loss Echo Jitter Latency Quality Comfort Noise Coder Voice Activity Detection

12. Choosing the Right Coder

13. 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

14. 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

15. ETSI Test Setup

16. 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

17. ETSI Test Result for 10 Gateways

18. 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

19. 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

20. 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