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These materials are the copyright of John Wiley & Sons, Inc. and anydissemination, distribution, or unauthorized use is strictly prohibited.


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SIP TrunkingFORDUMmIES

SONUS SPECIAL EDITION

by Pat Hurley



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SIP Trunking For Dummies, Sonus Special Edition

Published byJohn Wiley & Sons, Inc.111 River StreetHoboken, NJ 07030-5774

www.wiley.com

Copyright 2012 by John Wiley & Sons, Inc., Hoboken, New Jersey

Published by John Wiley & Sons, Inc., Hoboken, New Jersey

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Contents at a Glance

Introduction ............................................................................................... 1

Chapter 1: Getting Acquainted with SIP Trunking ................................ 5

Chapter 2: Seeing the Benefits of SIP Trunking ................................... 13

Chapter 3: Reaping the ROI Benefits of SIP Trunking ......................... 21

Chapter 4: Taking a Peek at SIP Trunking Considerations ................. 31

Chapter 5: Ten Reasons to Choose Sonus SBCs for SIP Trunking..... 39

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Table of Contents

Introduction 1

About This Book ........................................................................ 1

How This Book Is Organized .................................................... 2

Icons Used in This Book ............................................................ 3

Chapter 1: Getting Acquainted with SIP Trunking 5

Introducing Enterprise PBX Trunking ..................................... 6

Understanding the Types of Enterprise PBX Trunking ......... 6

Going Digital with PRI ...................................................... 7

Entering the SIP world..................................................... 7

Understanding How SIP Trunking Works ................................ 7

Introducing the Components of SIP Trunking ........................ 9

IP PBX ................................................................................ 9

Session border controllers ............................................. 9

Session Management System ....................................... 11ITSP /SIP service provider ............................................ 11

Chapter 2: Seeing the Benefits of SIP Trunking 13

Unifying Your Access Network ............................................... 13

Making management easier .......................................... 15

Simplifying growth ......................................................... 15

Deploying SIP Services More Easily ....................................... 16

Enabling Cloud-Based Services .............................................. 17

Making Your Network More Reliable and Resilient ............. 18Going Local and Eliminating 800 ............................................ 19

Chapter 3: Reaping the ROI Benefits of SIP Trunking 21

Making the Case for Migrating to SIP Trunking .................... 21

Aggregation of trunks .................................................... 22

Aggregation of access ................................................... 24

On-Net calling ................................................................. 24

Other cost savings ......................................................... 25

Looking at Case Studies .......................................................... 26Case Study #1: The global company ........................... 26

Case Study #2: The bank ............................................... 27

Case Study #3: The airline ............................................ 28

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Table of Contents v

Chapter 4: Taking a Peek at SIP TrunkingConsiderations 31

Considering Your ITSP ............................................................ 31

Pricing and pricing structure ....................................... 32

Dealing with DID and local calls ................................... 33

Dispersing aggregation points ..................................... 33

Quality of service ........................................................... 34

Blocking ................................................................ 34

Codecs .................................................................. 34

Agreements .......................................................... 35

Considering Your SBC ............................................................. 35

Chapter 5: Ten Reasons to Choose Sonus SBCsfor SIP Trunking 39

A Leader in SIP Communications ........................................... 39

Networked Policy Management for SBCs .............................. 39

Highest Performance ............................................................... 40

Better Transcoding Support ................................................... 40

Scalability.................................................................................. 41

Support for Future Apps through Media Support ............... 41Ironclad Security ...................................................................... 41

Guaranteed Interoperability ................................................... 42

Robust Session Management .................................................. 42

A Complete Package ................................................................ 42

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Publishers AcknowledgmentsWere proud of this book and of the people who worked on it. For details on how to

create a customFor Dummies book for your business or organization, contact [email protected]. For details on licensing theFor Dummies brand for products orservices, contact BrandedRights&[email protected].

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Acquisitions, Editorial, and Vertical

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Introduction

Most enterprises are familiar with VoIP (Voice overIP) and probably have begun at least thinking about

implementing Unified Communications (UC) a suite ofintegrated voice, video, data, and text communications

delivered via the VoIP protocol known as Session InitiationProtocol (SIP). In fact, many enterprises have begun to deploythese services but are still connecting their primary voicecommunications systems called Private Branch Exchanges(PBX) by using legacy Time Division Multiplexing (TDM) T1lines. This approach adds cost and complexity and makesyour network less ready for taking the next step in UC.

A better way to connect PBXs is to move past those expensive

T1s and on to an integrated Internet Protocol (IP) networkusing SIP trunking.SIP Trunking For Dummies, Sonus SpecialEdition, is here to help you understand this transition withsome timely information about SIP trunking, the serviceproviders and equipment that enable it, and the benefitsyou gain when you make your move to SIP trunking.

About This BookSIP Trunking For Dummies, Sonus Special Edition, is notwritten as a technical manual for telecom engineers lookingfor deep techie knowledge or tips for planning SIP trunkingdeployment there are plenty of 600-page technical booksfor those purposes. Instead, youll find that this book is designedfor the non-technical folks marketers, sales professionals,finance wizards, and so on in mid- and large-sized enterpriseswho want to save money and enable new UC services byadopting a SIP trunking solution. If you know a little bit aboutSIP trunking today, I think youll know more when youvefinished reading, and if you know nothing, dont worry; I walkyou through all you need to know before you take that salescall or put out your Request for Proposal (RFP).



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SIP Trunking For Dummies, Sonus Special Edition2

How This Book Is OrganizedThis book is organized into five chapters. As is the case in anyFor Dummies book, each of these chapters is self-contained,so you dont need to read the entire book from start to finish.If you see a chapter that you already know everything about,feel free to skip it. Whenever a complex topic from anotherchapter is raised, you see a reference to that chapter noneed to spend your time digging around in the table of contents.

Chapter 1: Getting Acquaintedwith SIP TrunkingChapter 1 introduces you to SIP trunking and trunking ingeneral. In this chapter, you discover enterprise PBX trunkingand how SIP trunking fits in with traditional methods like TDMtrunking over T1s. Then you learn how SIP trunking actuallyworks and what components you need to implement it.

Chapter 2: Seeing the Benefitsof SIP TrunkingChapter 2 is where you find the (many) benefits of adoptingSIP trunking, with a focus on operational rather than monetarybenefits. SIP trunking can simplify the management of your

network and enable the deployment of new UC services. SIPtrunking can also help you adopt cloud-based services.

Chapter 3: Reaping the ROIBenefits of SIP TrunkingSIP trunking is a huge money saver for many enterprises

saving many as much as 50 percent on their recurring telecomcosts. In this chapter, you discover what these Return onInvestment (ROI) benefits are all about. Youll also see somereal-world case study examples from three enterprises thatsuccessfully implemented SIP trunking. If youre in finance orhave a budget to worry about, youll enjoy this chapter.



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Introduction 3

Chapter 4: Taking a Peek at SIP

Trunking ConsiderationsIn Chapter 4, you find out the questions to ask and the thingsto consider before you commit to a SIP trunking deploymentand when you choose an Internet Telephony Service Provider(ITSP) to provide your SIP trunking service. You also see theimportant considerations to keep in mind when selecting aSession Border Controller (SBC).

Chapter 5: Ten Reasons to ChooseSonus SBCs for SIP Trunking

If you read Chapters 1 through 4, I hope youre sold on SIPtrunking and also have a good idea about what makes a goodSIP trunking solution. But even if you havent, Chapter 5 iswhere you look at some of the attributes of the SBCs offered

by Sonus and understand how Sonus SBCs may match up wellwith your SIP trunking needs.

Icons Used in This BookThis book calls out important bits of information with iconson the left margins of the page. Youll find three such icons inthe book.

The Tip icon points out bits of information that aid in yourunderstanding of SIP trunking or provides a trick of the tradeto help save you time, money, and much more.

The Remember icon points out textual tidbits that you shouldlock away in your memory for future use.

I try to keep the technical jargon and discussion to a minimum.You wont need to know these factoids to get the most out ofthe book, but you may find them interesting.



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sip trunking for dummies preview

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