ESN LLC v. Cisco Systems, Inc. et al

Filing 83

CLAIM CONSTRUCTION SUR-REPLY BRIEF filed by Cisco Systems, Inc., Cisco-Linksys LLC. (Attachments: # 1 Exhibit R, # 2 Exhibit S, # 3 Exhibit T, # 4 Exhibit U)(Smith, Kevin)

Exhibit U

N ETWORK I NG COUNCIL

Communications

Internet

Using SIP
Delivering V61P and Multimedia Services with Session Initiati Protocol

Henry Sinnreich AJohnston

Publisher: Robert Ipsen Editor. Carol A. Long Assistant Editor: Adaobi Obi Managing Editor: Geraldine Fahey Text Design & Composition : Thomas Technology Solutions, Inc. Designations used by companies to distinguish their products are often claimed as trademarks. In all instances where John Wiley & Sons, Inc., is aware of a claim , the product names appear in initial capital or Au wrmi, LErmrts . Readers, however, should contact the appropriate companies for more complete information regarding trademarks and registration. This book is printed on acid-free paper. Q

Copyright @ 2001 by Henry Sirweich, Alan B. Johnston. All rights reserved. Published by John Wiley & Sons, Inc., New York Published simultaneously in Canada. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as permitted under Sections 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, [phone], fax [phone]. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 605 Third Avenue, New York, NY 10158-0012, [phone], fax [phone], E-Mail: [e-mail].
This publication is designed to provide accurate and authoritative information in regard to the subject matter covered. It is sold with the understanding that the publisher is not engaged in professiorW services. If professional advice or other expert assistance is required, the services of a competent professional person should be sought. Library of Congress Cataloging- in Publication Data: Sinnreich, Henry. Internet communications using SIP: delivering V61P and multimedia services with session initiation protocol / Henry Sinnreich, Alan Johnston. p. em.--(Networking Council series) Includes bibliographical references and index. ISBN: 0-47141399-2 (cloth : alk. paper) 1. Computer network protocols. 2. Internet telephony. 3. Multimedia systems. I. Johnston, Alan. 11. Title. III. Wiley Networking Council Series .

TK5105.55.556 2001 004.6'2---dc21 2001045525
Printed in the United States of America.

1098765

This book is less about explaining the protocol details and how SIP works, but rather what SIP does and the new services enabled by SIP. Protocol details are kept to a minimum and mentioned only to the extent necessary to understand how the respective services can be built.
The book Internet Communications Using SIP.· Delivering VoIP and Multimedia Services with Session Initiation Protocols deals with redefining communications over the Internet, and is of interest to everybody in the telecommunications and Internet industry working in technology companies, for service providers and for students in the areas of communication and networks. The authors of this book have had the privilege to closely monitor and contribute to the development of the Session Initiation Protocol in the Internet Engineering Task Force and to its deployment for new IP communication services in WorldCom, Inc.

Working in the telecommunications industry, we discovered SIP and were struck by the same thought: SIP will revolutionize telecommunications!
SIP will also considerably enrich the Internet. To quote Vint Cerf: SIP is probably the third great protocol of the Internet, after TCP/IP and HTTP.
1The authors would like to credit Teresa Hastings from WorldCom for coining this expression.

XVii

xviii Preface Two factors drove us to write this book IP communications based on SIP is a rising tide for all ships and we want to convey the message . At the same time many concepts from legacy telephony networks are still trying to make it to the Internet , such as H.323 signaling and the "softswitch" type of central control, and we believe this requires a better understanding of SIP.
The exciting and very demanding protocol development work in the IETF SIP and other Working Groups has provided an incredible environment for critical assessment and open discussion of many detailed aspects of IP communications . SIP has generated so many contributions, that overload is one of the main challenges of the SIP working group. SIP is spilling over into several new working groups in the IETF and is also pufsued in other international standards organizations.

Finally, this book is about practical implementation and network design. For the past three years, the authors have been involved in the design of a carrier class SIP network and services.
The topics in this book reflect the multiple design and implementation issues and also the decisions service providers have to make to provide SIP based IP communication services. The authors have had the benefit of working with some of the leading experts on SIP from the IETF, WoridCom, and from many vendors in this emerging field. Real time IP communications are by no means a closed chapter, so we had also to rely on concepts that are discussed in IETF working groups or have been proposed by various engineers, without having as yet been accepted as a standard , or even enjoy rough consensus.

Important lessons were learned from implementing SIP and not least after both authors installed SIP phones at home and in the office. Memorable evenings and weekends were spent discussing the protocol and the book on our flawless SIP phone connection over the public Internet (using cable modem and DSL Internet access ), and also within the enterprise network and for overseas. Hopefully some of this " hands on" experience has found its way into the book.