Voice Quality

Failed Calls

Dropped Calls

One Way Audio

Echo Noise Low

Volume Delayed

Audio Broken

Up Audio Distorted

Audio

Network Core Performance

Call Reliability Audio Quality

Voice Quality Issues

Gateways Devices

Network Considerations

Network Conditions Acceptable Quality Optimal Quality Interarrival packet jitter (avg) ≤ 10ms ≤ 5ms

Interarrival packet jitter(max) ≤ 80ms ≤ 40ms

Packet loss rate (avg) ≤ 10% ≤ 2%

Network latency RTT ≤ 200ms ≤ 120ms

1 2 3 4 5

1 4 2 5 3

SRTP / RTCP

SIP

SRTP / RTCP

1 2 3 4 2 3

F

E

C

4 5

1 4 2 5

1 2 4 5

SIP

1 2 3 4 5

Codec RTAudio - 8Khz

RTAudio - 16 Khz

Siren G.711 G.722 RTVideo -CIF 15fps

RTVideo -VGA 30fps

RTVideo -HD 30fps

Typical Bandwidth – No Fec

25.9 kbps 34.8 kbps 22 kbps 59.8 kbps 42.8 kbps 203 kbps 492 kbps 1230 kbps

Upper Limit – No FEC 39.8 kbps 57 kbps 51.6 kbps 92 kbps 99.6 kbps 250 kbps 600 kbps 1500 kbps

Upper Limit - FEC 51.6 kbps 86 kbps 67.6 kbps 156 kbps 163.6 kbps n/a n/a n/a

Bandwidth numbers include overhead for framing, encryption, and IP routing information in addition to actual encoded media and based on 20ms audio p-times

Typical bandwidth values bit rate are measurements of typical activity level values under good network conditions (i.e. no FEC for audio sessions)

Typical BW number can be used for capacity planning to assess if a network should be considered „right provisioned‟

Average can be used for initial capacity planning where most calls are within enterprise network

Monitor actual Bandwidth usage of UC sessions and then refine

Example Scenario

Redmond

WAN Link Policy: Audio Session Limit = 60 kbps

RT Audio WB (no FEC)

CAC Profile Type WAN Link Per Session Audio Limit

Available Audio WAN Link per Session Video Limit

Available Video

Optimized for Session Count

(w/ Wide Band P2P)

60 kbps RTAudio NB + FEC Siren + FEC

RTAudio WB (no FEC)

350 kbps RTVideo – CIF (15fps) RTVideo – Pano (15fps)

Balanced 95 kbps (Above plus) RTAudio WB + FEC

G.711 (no FEC) G.722 (no FEC)

600 kbps (Above plus) RTVideo – VGA (30fps)

Optimized for Quality 165 kbps (All Above plus) G.711 + FEC G.722 + FEC

1500 kbps (All Above plus) RTVideo – HD (30fps)

New Orleans

Example Scenario

New Orleans Redmond Internet

WAN Link Policy: Audio Session Limit = 60 kbps

CAC Profile Type WAN Link Per Session Audio Limit

Available Audio WAN Link per Session Video Limit

Available Video

Optimized for Session Count

(w/ Wide Band P2P)

60 kbps RTAudio NB + FEC Siren + FEC

RTAudio WB (no FEC)

350 kbps RTVideo – CIF (15fps) RTVideo – Pano (15fps)

Balanced 95 kbps (Above plus) RTAudio WB + FEC

G.711 (no FEC) G.722 (no FEC)

600 kbps (Above plus) RTVideo – VGA (30fps)

Optimized for Quality 165 kbps (All Above plus) G.711 + FEC G.722 + FEC

1500 kbps (All Above plus) RTVideo – HD (30fps)

RT Audio WB (No FEC)

Example Scenario

New Orleans Redmond Internet

WAN Link Policy: Audio Session Limit = 60 kbps

CAC Profile Type WAN Link Per Session Audio Limit

Available Audio WAN Link per Session Video Limit

Available Video

Optimized for Session Count

(w/ Wide Band P2P)

60 kbps RTAudio NB + FEC Siren + FEC

RTAudio WB (no FEC)

350 kbps RTVideo – CIF (15fps) RTVideo – Pano (15fps)

Balanced 95 kbps (Above plus) RTAudio WB + FEC

G.711 (no FEC) G.722 (no FEC)

600 kbps (Above plus) RTVideo – VGA (30fps)

Optimized for Quality 165 kbps (All Above plus) G.711 + FEC G.722 + FEC

1500 kbps (All Above plus) RTVideo – HD (30fps)

RT Audio NB (+ FEC)

0

1000

2000

3000

4000

5000

19

:21

,1

29

:36

,1

39

:51

,1

50

:06

,1

00

:21

,1

10

:36

,1

20

:51

,1

31

:06

,1

41

:21

,1

51

:36

,1

01

:06

,0

06

:06

,1

11

:21

,1

16

:21

,1

22

:51

,1

33

:06

,1

43

:21

,1

53

:36

,1

03

:51

,1

14

:06

,1

24

:21

,1

34

:36

,1

44

:51

,1

55

:06

,1

05

:21

,1

Kilobits/sec sent by Sharer

Screen Size Acceptable Optimal

1280x800 384 Kbps 1.5 Mbps

1440x900 512 Kbps 2 Mbps

1680x1050 768 Kbps 2.75 Mbps

1920x1200 1 Mbps 3.5 Mbps

Media Type Per Hop Behavior

Queuing and Dropping

Notes:

Audio EF Priority Queue Low loss, low latency, low jitter, assured bandwidth Pair with WAN Bandwidth Policies on constrained links

Video AF41 BW Queue + DSCP WRED

Class 4. Low drop priority. Pair with WAN Bandwidth Policies on constrained links

SIP Signaling CS3 BW Queue Class 3. Bandwidth allocation should be sufficient to avoid drops

App Sharing AF21 BW Queue + DSCP WRED

Class 2. Low drop priority. Pair with End User Policy Caps

File Transfer AF11 BW Queue + DSCP WRED

Class 1. Low drop priority. Pair with End User Policy Caps

Core Performance, Devices and Gateways

In Microsoft Communications Server “14” media for calls within a site can go directly to PSTN Gateway

Improves audio quality and reduces numbers of servers

Today 5pm UNC314 CS “14”: Voice Deployment

Thursday 9:45AM - UNC208 CS “14”: What's New in Devices

E2E Experiences: Admins

Weds 1.30pm - UNC316 - CS “14”: Monitoring and Reporting

E2E Experiences: End Users

Admin Extensibility

Succeed at Voice Quality with Microsoft’s software powered Unified Communications and redefine what it means to

communicate in your business!

Monday 4:30PM UNC320 CS “14”: What's New in Communicator “14” Experience & Backend Amit Gupta

Tuesday

9:45AM UNC311 CS “14”: Architecture Mahendra Sekaran

1:30PM UNC313 CS “14”: Voice Architecture and Planning for High Availability Jamie Stark

3:15PM UNC312 CS “14”: Network Considerations Neil Deason

5:00PM UNC314 CS “14”: Voice Deployment Jamie Stark

Wednesday

8:00AM UNC318 CS “14”: What's New in Conferencing Experience & Backend Cameron & Tim

9:45AM UNC317 CS “14”: Management Experience Anand & Cezar

11:45AM UNC321 CS “14”: Interoperability: Voice, Video, Conferencing, IM, & Presence Francois Doremieux

1:30PM UNC316 CS “14”: Monitoring and Reporting Jared & Neil

5:00PM UNC315 CS “14”: Setup and Deployment Peter Schmatz

Thursday 9:45AM UNC208 CS “14”: What's New in Devices Avi & Sachin

TechEd Online

microsoft.com/communicationsserver

Technical LibraryNextHop DrRez on Twitter

Communications Server Exchange Server

Partner Link Customer Link

Exchange 2010 SP1 Beta download

www.microsoft.com/teched www.microsoft.com/learning

http://microsoft.com/technet http://microsoft.com/msdn

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