Quality of Service – State of the Market
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Transcript of Quality of Service – State of the Market
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Quality of Service – State of the Market
Alan PercyDirector of Business
DevelopmentAudioCodes, [email protected] #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 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
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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
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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 can’t 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?
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”)
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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?
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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
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
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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 GatewaysP1
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
Alan PercyDirector of Business
DevelopmentAudioCodes, [email protected] #822
Come and meet us at the Keynote!
Thursday @ 5:15