Voice Quality Voice Quality Issues Call Reliability Dropped Calls Failed Calls Network Audio Quality Broken Up Audio Delayed Audio Distorted Audio Core Performance Low Volume Gateways Noise Echo Devices One Way Audio.
Download ReportTranscript Voice Quality Voice Quality Issues Call Reliability Dropped Calls Failed Calls Network Audio Quality Broken Up Audio Delayed Audio Distorted Audio Core Performance Low Volume Gateways Noise Echo Devices One Way Audio.
Voice Quality Voice Quality Issues Call Reliability Dropped Calls Failed Calls Network Audio Quality Broken Up Audio Delayed Audio Distorted Audio Core Performance Low Volume Gateways Noise Echo Devices One Way Audio 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 SIP SRTP / RTCP 1 1 2 3 4 5 2 3 4 5 SIP SRTP / RTCP 1 1 1 2 3 4 5 F E C 1 2 2 3 3 4 4 5 2 4 2 4 5 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 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) WAN Link Policy: Audio Session Limit = 60 kbps RT Audio WB (no FEC) Redmond New Orleans Example Scenario 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) WAN Link Policy: Audio Session Limit = 60 kbps Internet RT Audio WB (No FEC) Redmond New Orleans Example Scenario 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) WAN Link Policy: Audio Session Limit = 60 kbps Internet RT Audio NB (+ FEC) Redmond New Orleans 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 5000 4000 Kilobits/sec sent by Sharer 3000 2000 1000 0 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: Priority Queue Low loss, low latency, low jitter, assured bandwidth Pair with WAN Bandwidth Policies on constrained links Audio EF 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 Tuesday 4:30PM UNC320 CS “14”: What's New in Communicator “14” Experience & Backend Amit Gupta 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 8:00AM UNC318 CS “14”: What's New in Conferencing Experience & Backend Cameron & Tim 9:45AM UNC317 CS “14”: Management Experience Anand & Cezar Wednesday 11:45AM UNC321 CS “14”: Interoperability: Voice, Video, Conferencing, IM, & Presence Thursday Francois Doremieux 1:30PM UNC316 CS “14”: Monitoring and Reporting Jared & Neil 5:00PM UNC315 CS “14”: Setup and Deployment Peter Schmatz 9:45AM UNC208 CS “14”: What's New in Devices Avi & Sachin TechEd Online microsoft.com/communicationsserver Technical Library NextHop Partner Link Customer Link Exchange 2010 SP1 Beta download DrRez on Twitter Communications Server Exchange Server www.microsoft.com/teched www.microsoft.com/learning http://microsoft.com/technet http://microsoft.com/msdn Sign up for Tech·Ed 2011 and save $500 starting June 8 – June 31st http://northamerica.msteched.com/registration You can also register at the North America 2011 kiosk located at registration Join us in Atlanta next year