Module 13 - Microsoft Lync Server 2010

Transcript Module 13 - Microsoft Lync Server 2010

Microsoft

Lync™ Server 2010 Voice Quality Considerations

Module 13 Microsoft Corporation

Session Objectives

• • • • Understand the important factors that determine end user voice quality experiences Use the Lync Server 2010 support for network layer voice traffic management Recognize the Lync Server 2010 improvements for voice quality performance and end user experiences Know how to monitor and diagnose voice quality issues 2

Voice Quality

• • •

What Defines Voice Quality?

• • Call Reliability Calls get established as expected Calls do not drop midway through • Audio Quality Users are able to hear everything they need to in their calls • • Who Matters • User quality of experience Can I make voice calls successfully?

• Admin quality of life Can I discover, diagnose, and resolve voice quality issues effectively?

• •

What Constitutes “Good” Voice Quality?

• • Good really means good enough • Starting point for expectations for most Information Workers (IW) is legacy private branch exchange (PBX) for desktop phone High reliability • • Narrow band audio “Good enough” can still be highly personal and context sensitive • • Up to a point, users will accept lower voice quality given other advantages Mobile phones trade mobility for lower call reliability Internet VoIP users trade price for audio quality Bottom Line: Users not noticing voice quality issues is what defines success here 5

Network Considerations

Voice Quality & Bandwidth

Anatomy of a UC Audio Session

SIP RTP / RTCP 1 2 3 4 5 1 2 3 4 5 8

Anatomy of a UC Audio Session

SIP RTP / RTCP 1 2 1 2 1 2 3 F E C 4 5 1 2 2 3 3 4 4 5 4 5 4 5 9

• Microsoft Lync Server 2010 Bandwidth Requirements • • • How much bandwidth is required is determined by: Codec • Network performance Poor network performance results in redundant encoding of audio content (Forward Error Correction) • Content Voice activity, video motion, app content • • • • Microsoft Lync Server 2010 Media Endpoints actively manage distribution of bandwidth across UC modalities Prioritizes Audio first and distributes remaining bandwidth to app sharing, video, and file transfer as required Chooses the best quality audio codec and video resolution for available bandwidth May dynamically change codec choices during a session 10

• • • •

UC Session Bandwidth Costs

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

Audio/Video Capacity Planning for Peer-to-Peer Sessions Audio Audio Media Main video CIF Codec

RTAudio Wideband RTAudio Narrowband RTVideo

Typical stream bandwidth (Kbps) Maximum stream bandwidth without FEC

39.8

62 29.3

220 44.8

260

Maximum stream bandwidth with FEC

91 56.6

Not applicable Typical bandwidth values bit rate are measurements of typical activity level values under good network conditions (i.e. no FEC for audio sessions)

Main video VGA Main video HD Panoramic video

RTVideo RTVideo RTVideo 508 1210 269 610 1510 360 Typical bandwidth number can be used for capacity planning to assess if a network should be considered “right provisioned” Upper Limit numbers can be used for initial capacity planning • Monitor actual Bandwidth usage of UC sessions and then refine

Audio/Video Capacity Planning for Conferences Audio Audio Main video CIF Main video VGA Panoramic video

G.722

Siren RTVideo RTVideo RTVideo 46.1

25.5

220 508 269 100.6

52.6

260 610 360

Audio Capacity Planning for PSTN Audio

G.711

64.8

Audio

RTAudio Narrowband 30.9

97 44.8

Not applicable Not applicable Not applicable 164.6

68.6

Not applicable Not applicable Not applicable 161 56.6

Network Layer Voice Traffic Management

• • •

Network Quality of Service – DiffServ

• • Where do we recommend Quality of Service (QoS)?

When Right Provisioning not possible and so Constrained WAN Links (pair with WAN bandwidth Policies) Audio prioritization already deployed for other Voice over Internet Protocol (VoIP) solution (ensure level playing field) Differentiated Services Code Point (DSCP) - field in an IP packet to assign levels of service for network traffic Example “Fully Managed” Network Deployment

Media Type

Audio Video SIP Signaling App Sharing File Transfer

Per Hop Behavior

EF AF41 CS3 AF21 AF11

Queuing and Dropping

Priority Queue BW Queue + DSCP WRED BW Queue BW Queue + DSCP WRED BW Queue + DSCP WRED

Notes:

Low loss, low latency, low jitter, assured bandwidth Pair with WAN Bandwidth Policies on constrained links Class 4. Low drop priority.

Pair with WAN Bandwidth Policies on constrained links Class 3.

Bandwidth allocation should be sufficient to avoid drops Class 2. Low drop priority.

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

Pair with End User Policy Caps 13

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Network Quality of Service – DiffServ

• • • How to deploy Configure separate port ranges for Lync audio, video, app sharing, and file transfer traffic • • • • User same port range for audio on AV Conferencing Servers, Mediation Servers, Conferencing Auto Attendant (CAA), Conferencing Announcement Service (CAS), Response Group Service (RGS), Call Park Use separate port range for video on AV Conferencing Server Use separate port range for app sharing on AS Conferencing Server • • Make Client audio/video port ranges subset of Servers E.g. Server audio port range = 49,152 – 57,500 Client audio port range = 57,480 – 57,500 • Environmental factors Windows ® 7 and Windows Vista ® Lync 2010 users only use Windows Policy based QoS to mark based on application and port ranges Windows XP ® Lync 2010 user then marks at router based on port ranges only (or use Generic QoS) Lync 2010 Phones mark at endpoints 14

• • • •

Virtual Local Area Network VLAN Support

VLANs can help with address space management when deploying a large number of Lync 2010 IP phones • • VLAN Discovery by Lync Phones Link Layer Discovery Protocol (LLDP) support added in Lync Server 2010 for VLAN discovery (plus E.911 location information and power management) DHCP option still available where LLDP is not supported 802.1P traffic prioritization also supported for Office Communications Server (OCS) 2007 R2 Phones • Recommendations Limit use of VLAN for OCS Phones and address space/port management 15

Microsoft Lync Server 2010 Voice Quality Improvements

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Media Bypass

Lync Server 2010 introduces media bypass of the Mediation Server: • In OCS 2007 and OCS 2007 R2 of UC-PSTN call signaling and media always passes through a Mediation Server • • In Lync Server 2010, whenever possible, media for those calls will flow directly to the gateway (GW) without traversing Mediation Server Applies where media streams stay within a site • • Improves Audio Quality and facilitates reduction of TCO • Direct routing of media between Lync 2010 endpoints and GWs means no redundant network hops are used Saves Bandwidth and reduces end-to-end audio latency • • Less media processing on Mediation Server Fewer Mediation Servers deployed Recommend collocation of MS role with Front Ends 17

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Lync Server 2010 Core Performance

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Improvements

Calls staying established • • • • • Signaling and media are separate sessions Signaling TCP • Media UDP or TCP Voice Resiliency allows to continue in the event of disruption to the signaling session Middleboxes resetting TCP connections Microsoft Lync Server 2010 failover • • • Higher quality audio (and video) • Less echo, less noise Improved AEC filter bank and Dynamic Non-Linear Processing • • Improved voice quality in conferencing Default voice codec in conference is G.722

VGA video conferencing Optimizations for supporting audio/video on netbooks 18

Devices and Gateways

• • • • • • • Lync Server 2010 introduces the next generation of stand alone Lync 2010 Phone devices Wider range of stand alone IP phones spanning Common Area, IW Desk Worker, Executive and Conference Room devices • New USB phone devices for low cost desktop phone replacement Initial trial deployment of 600 in MSIT resulted in a net satisfaction (NSAT) score of 153 – highest scoring device ever deployed New hardware ergonomic and acoustics Improved speakerphone performance • Certification Audio Performance testing added to the certification program for both Devices and GWs • System Center Operations Manager (SCOM) Advanced partners will provide a SCOM pack to allow GW monitoring in same Management Interface as Lync Server Roles 19

E2E Experiences: End Users

Demo: End User Experience

Admin Extensibility

• • • • •

Summary – End User Experiences

• • Provide direct, actionable feedback to end users on voice quality issues Help them understand and optimize experience Reduce calls to helpdesk Simplified audio device management Higher visibility of “test call” option • Automatic detection of multiple laptops in same room More than one person in a conference room connected to audio with open speaker/microphone causes echo • In call audio quality notifications Extensible by Admin to add link to local support pages 23

E2E Experiences: Admins

Demo: Admin Experience

Session Failure Rate Metrics

• • • • • • • Some failures have multiple root causes; some benign and some real problems 10404 – “User not found” • Did user misdial a phone number or did Admin misconfigure routing rule mangle the number?

52021 – “Call terminated on media connectivity?” • • Did user drop from wireless network or did server crash?

52074 – “Previous sign out was abnormal” Did user PC crash/run out of power/lose network or did a HLB/router/server fail? Use 3:00 am wake-up call test to help classify Monitor call reliability through unexpected failures • Expected failures can still be important Establish baselines of expected failures and identify significant deviations from them 26

Summary – Admin Experiences

• • • • • • • • Richer reports for UC usage and quality monitoring Report key cost saving data for ROI Analysis Targeted reports for Session Reliability and Audio Quality Provide IP phone reports for Asset Management • A dashboard with key usage and diagnostic information Proactively inform Admins summary trends for usage and health of the deployment • • Comprehensive data for usage tracking and voice quality diagnostics: Collected usage data for Lync Server 2010 new features Collected data for conference, registration, device and Lync Server 2010 new feature diagnostics Optimized call CDR and QoE database schema to support partners developing third party Monitoring solutions • • Improved SCOM alerting: Added call reliability monitoring and alerting Enhanced media quality monitoring and alerting for locations and gateways 27

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Key Takeaways

• • • • Recipe for Success • • Network Bandwidth policies, including CAC Support for DiffServ and VLANs • Devices and Gateways Exciting new range of Phones • Microsoft certification Core performance improvements • • Session Resiliency Media Performance Rich End user and admin experiences Succeed at Voice Quality and redefine what it means to communicate in your business 28

Q&A

Demo: End User Experience

Device Selection

Test Call

Admin Extensibility

In Call Audio Quality Feedback

Disaster Recovery

Demo: Admin Experience

QMS Reports

Location Based Audio Quality

Session Reliability Summary

Session Reliability Trends

Top Failures

User Activity Report

Session Detail Drill Down

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