Lab 07 - Configuring Call Admission Control in Lync

Microsoft

®

Lync™ Server 2010

Ignite

Lab 7: Configuring Call Admission Control in

and/or other countries.

The names of actual companies and products mentioned herein may be the trademarks of their

respective owners.

THE CONTENTS OF THIS PACKAGE ARE FOR INFORMATIONAL AND TRAINING PURPOSES ONLY AND ARE PROVIDED

"AS IS" WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE

IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.

No part of the text or software included in this training package may be reproduced or transmitted

in any form or by any means, electronic or mechanical, including photocopying, recording, or any

information storage and retrieval system, without permission from Microsoft

. Because Microsoft

This content is proprietary and confidential, and is intended only for users described in the content

provided in this document. This content and information is provided to you under a Non-Disclosure

Agreement and cannot be distributed. Copying, disclosing all or any portion of the content and/or

information included in this document is strictly prohibited.

Table of Contents

Lab: Configuring Call Admission Control in Microsoft Lync Server 2010 ........................................ 1

Exercise 0: Preparing the Lab Environment ................................................................................. 4

Exercise 1: Configuring Call Admission Control ........................................................................... 7

Exercise 2: Verifying Bandwidth Policy Operation ..................................................................... 11

Lync Server 2010

During this lab, you will go through the steps for planning and then configuring the new Call

Admission Control (CAC) feature of Microsoft

Lync™ Server 2010. Real-time communications are

sensitive to the latency and packet loss that can occur on congested networks. CAC functionality

(also known as bandwidth management) has been added in Lync Server 2010 to help prevent poor

quality of experience for users on congested networks. CAC determines, based on available

network bandwidth, whether to allow real-time communications sessions to be established. CAC

can also provide an alternative route for calls when the preferred route does not have the required

bandwidth.

server interacts with on the gateway side do not support Lync Server 2010 bandwidth

management. Thus, the Mediation server has to handle bandwidth interactions on behalf of its

gateway peer. Whenever possible, the Mediation server will do a-priori bandwidth reservation. If

this is not possible (for example, the locality of the ultimate media endpoint on the gateway side

is unknown for an outgoing call to the gateway peer), post-facto bandwidth reservation is done.

This may result in over-subscription, but it is the only way to prevent false-ring scenarios.

Media bypass and bandwidth reservation are mutually exclusive. If a media bypass is employed

for a call, call admission control is not performed for that call. The assumption here is that there

are no links with constrained bandwidth involved in the call. If call admission control is used for

a particular call that involves the Mediation server, that call cannot employ media bypass.

(PSTN), verify PSTN functionality and capacity.