These materials are © 2014 John Wiley & Sons, Inc. Any dissemination, distribution, or unauthorized use is strictly prohibited. Voice over LTE Sonus Special Edition By Pat Hurley These materials are © 2014 John Wiley & Sons, Inc. Any dissemination, distribution, or unauthorized use is strictly prohibited. Voice over LTE For Dummies®, Sonus Special Edition Published by John Wiley & Sons, Inc. 111 River Street Hoboken, NJ 07030-5774 www.wiley.com Copyright © 2014 by John Wiley & Sons, Inc. 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 the prior written permission of the Publisher. 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ISBN: 978-1-118-95115-6 (pbk); ISBN: 978-1-118-95252-8 (ebk) Manufactured in the United States of America 10 9 8 7 6 5 4 3 2 1 These materials are © 2014 John Wiley & Sons, Inc. Any dissemination, distribution, or unauthorized use is strictly prohibited. Table of Contents Introduction ..................................... .1 About This Book ........................................................................ 1 Icons Used in This Book ............................................................ 2 Chapter 1: Get ting Acquainted with Voice over LTE ..... .3 Just What is VoLTE, Anyway? .................................................. 4 Understanding the Motivation behind VoLTE ....................... 4 Grasping the Importance of VoLTE ......................................... 5 Looking at the Elements that Make Up VoLTE ....................... 8 Chapter 2: Understanding How VoLTE Works ........ .9 Comparing VoLTE to Legacy Mobile Voice Services ........... 10 Understanding Specific VoLTE Requirements ..................... 10 Looking at the Services Enabled by VoLTE .......................... 12 Tuning into VoLTE Security .................................................... 13 Interacting with Existing 3G Networks .................................. 15 Chapter 3: Looking at the Benefits of VoLTE ........ .17 VoLTE in Enterprise Unified Communications .................... 17 Understanding the VoLTE Business Case ............................. 20 For the enterprise .......................................................... 21 Benefitting service providers ....................................... 22 Affecting third-party hosted services ......................... 24 Chapter 4: Defining the Role of the SBC in VoLTE .... 25 Patrolling the Borders ............................................................. 26 Enabling New Services ............................................................ 27 Connecting with Existing Voice Services .............................. 29 Chapter 5: Understanding the Role of Diameter Signaling Controllers in VoLTE ................. .31 Learning about Diameter ........................................................ 32 Explaining the Diameter protocol................................ 32 Meeting the DSC ............................................................. 33 Working in tandem with SIP ......................................... 34 Roaming to Other VoLTE Networks ...................................... 34 Roaming to Other Legacy Networks ...................................... 35 Controlling Signaling Traffic ................................................... 36 These materials are © 2014 John Wiley & Sons, Inc. Any dissemination, distribution, or unauthorized use is strictly prohibited. iv Voice over LTE For Dummies, Sonus Special Edition Chapter 6: Ten Reasons to Choose Sonus for VoLTE .............................. .37 VoIP Experience ....................................................................... 37 Carrier Grade ............................................................................ 38 Interworking with 3G ............................................................... 38 Advanced Routing and Screening .......................................... 38 Scaling with the Software-Based SBC .................................... 39 Using a Common Code Base ................................................... 39 Supporting Advanced Media Types....................................... 40 Assuring QoS ............................................................................ 40 Playing Well with Other Vendors ........................................... 40 Exhibiting Discretion ............................................................... 41 Dealing with the Broadest Profile .......................................... 42 Making Diameter Comprehensive .......................................... 42 These materials are © 2014 John Wiley & Sons, Inc. Any dissemination, distribution, or unauthorized use is strictly prohibited. Publisher’s Acknowledgments We’re proud of this book and of the people who worked on it. Some of the people who helped bring this book to market include the following: Project Editor: Carrie A. Johnson Acquisitions Editor: Katie Mohr Editorial Manager: Rev Mengle Business Development Representative: Sue Blessing Custom Publishing Project Specialist: Michael Sullivan Production Coordinator: Melissa Cossell These materials are © 2014 John Wiley & Sons, Inc. Any dissemination, distribution, or unauthorized use is strictly prohibited. These materials are © 2014 John Wiley & Sons, Inc. Any dissemination, distribution, or unauthorized use is strictly prohibited. Introduction oice over LTE (VoLTE) is the next big transformation Vfor mobile operators. VoLTE is essentially Voice over Internet Protocol (VoIP) for mobile networks. Just as wireline carriers have been abandoning traditional circuit-switched voice for VoIP over the past decade, now mobile carriers are looking to do the same. As these companies complete their transitions from 3G mobile services to Long Term Evolution (LTE) 4G, they’ve reached an inflection point because unlike all previous mobile network standards, LTE is entirely packet based, even for voice. (In previous networks, the voice component of mobile services was circuit-switched.) In order to get to the end state of “all 4G everywhere,” carriers need to move away from traditional circuit-switched voice services and transition those services to the packet network. Because VoLTE is a completely different way of providing voice (and related services such as text messaging [SMS] and videoconferencing) over the mobile network, many new fea- tures and functionalities will be involved in building out this future mobile operator network. About This Book Voice over LTE For Dummies, Sonus Special Edition, is here to help you understand what VoLTE is all about, what it takes to deploy it, and the benefits you gain when you make your move to VoLTE. This book isn’t written to give you a deep technical understanding or tips for developing VoLTE applications — trust me, there’s plenty of source code and technical documentation online for your reading pleasure. Instead, this book is designed for nontechnical folks — marketers, sales professionals,