Quality of Service – State of the Market

Quality of Service – State of the Market

Alan PercyDirector of Business

DevelopmentAudioCodes, [email protected] #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

Customer demand is building

VoBB carriers are proliferating

What will differentiate the carriers?

Consumer VoIP Subscribers

0

2

4

6

8

10

'03 '04 '05 '06 '07 '08

Year

in m

illio

ns

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

G a t e w a y

I P

E 1

N I S T N e t

P a c k e t M O N I T O R

E 1

P a c k e t L o s s D e l a y

O u t p u t

H E A D a c o u s t i c s T e s t S y s t e m AA CC QQ UU AA

I n p u t

G a t e w a y I P I P

I S D N D S S 1 I S D N D S S 1

P B X

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 GatewaysP1

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

Alan PercyDirector of Business

DevelopmentAudioCodes, [email protected] #822

Come and meet us at the Keynote!

Thursday @ 5:15