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SIP Trunking

By Christina Hattingh, Darryl Sladden, ATM Zakaria Swapan
Published Feb 18, 2010 by Cisco Press.

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Copyright 2010
Edition: 1st

Book
ISBN-10: 1-58705-944-4
ISBN-13: 978-1-58705-944-5

The first complete guide to planning, evaluating, and implementing high-value SIP trunking solutions

Most large enterprises have switched to IP telephony, and service provider backbone networks have largely converted to VoIP transport. But there’s a key missing link: most businesses still connect to their service providers via old-fashioned, inflexible TDM trunks. Now, three Cisco^® experts show how to use Session Initiation Protocol (SIP) trunking to eliminate legacy interconnects and gain the full benefits of end-to-end VoIP.

Written for enterprise decision-makers, network architects, consultants, and service providers, this book demystifies SIP trunking technology and trends and brings unprecedented clarity to the transition from TDM to SIP interconnects. The authors separate the true benefits of SIP trunking from the myths and help you systematically evaluate and compare service provider offerings. You will find detailed cost analyses, including guidance on identifying realistic, achievable savings.

SIP Trunking also introduces essential techniques for optimizing network design and security, introduces proven best practices for implementation, and shows how to apply them through a start-to-finish case study.

Christina Hattingh, member of the technical staff in the Cisco Access Routing Technology Group (ARTG), has been involved with Cisco VoIP technologies from their inception and continues to consult and deliver training in these areas. Darryl Sladden, a Cisco Senior Product Manager, has been a key architect of the Cisco Unified Border Element and the Cisco SIP Trunking strategy as well as a key contributor to the AS5000 product, and several other Cisco VoIP technologies. ATM Zakaria Swapan, Cisco ARTG member of technical staff, has been a key contributor to the Cisco SIP development, Cisco Unified Border Element, VoIP Gateway, Secure Unified Communications, Wireless Voice, QoS & Call Admission Control and several other VoIP technologies.

• Discover the advanced Unified Communications solutions that SIP trunking facilitates

• Systematically plan and prepare your network for SIP trunking

• Generate effective RFPs for SIP trunking

• Ask service providers the right questions-–and make sense of their answers

• Compare SIP deployment models and assess their tradeoffs

• Address key network design issues, including security, call admission control, and call flows

• Manage SIP/TDM interworking throughout the transition

This IP communications book is part of the Cisco Press® Networking Technology Series. IP communications titles from Cisco Press help networking professionals understand voice and IP telephony technologies, plan and design converged networks, and implement network solutions for increased productivity.

Online Sample Chapter

SIP Trunking Design and Implementation Considerations

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Introduction xix

Part I: From TDM Trunking to SIP Trunking

Chapter 1 Overview of IP Telephony 1

History of IP Telephony 1

Basic Components of IP Telephony 2

Microphones and Speakers 2

Digital Signal Processors 3

Comparing VoIP Signaling Protocols 4

Call Control Elements of IP Telephony 5

Other Physical Components of IP Telephony 5

IP Phones 6

IP-PBX 6

Ethernet Switches 6

Non-IP Phone IP Telephony Devices 6

WAN Connectivity Device 6

Voice Gateways 7

Supplementary Services 9

Summary 10

Chapter 2 Trends in IP Telephony 11

Major Trends in IP Communications 12

Enterprise IP Communications Endpoints 13

Desktop Handset Trends 15

Enterprise Softphone IP Phone Trends 16

Enterprise WiFi IP Phone Trends 17

Cellular Phone Trends Within Enterprises and Their Effects on SIP Trunking 18

Endpoint Trends in Enterprises and Their Effects on SIP Trunk 19

Feature Trends in SIP Trunking Within the Enterprise 20

Feature Trends in SIP Trunking Between Enterprises 22

Feature Trends in SIP Trunk for PSTN Access 24

Feature Trends in Advanced SIP Trunking Features from

Service Providers 26

Feature Trends for Call Centers Services from SIP Trunk Providers 28

Summary 30

Chapter 3 Transitioning to SIP Trunks 31

Phase I: Assess the Current State of Trunking 33

Phase II: Determining the Priority of the Project 34

Phase III: Gather Information from the Local SPs 35

Phase IV: Conducting a Pilot Implementation of SIP Trunks for PSTN Access 35

Phase V: Transitioning a Live Department to SIP Trunks 37

Phase VI: Transition to SIP Trunking for Call Center Locations 38

Phase VII: Transition to SIP Trunking at Headquarters Locations 39

Phase VIII: Transition to SIP Trunking of Branch Locations 40

Phase IX: Transition Any Remaining Trunk to SIP Trunking 41

Phase X: Post Project Assessment 41

Summary 43

Chapter 4 Cost Analysis 45

Capital Costs 46

Cost of Installation 47

Cost of Equipment 47

Border Element Chassis Cost 48

Port Cost 48

Digital Signal Processor (DSP) Cost 48

Software License Cost 49

Monthly Recurring Costs 49

Port/Line Charge 49

Bandwidth Charge 50

Service Level Agreement Charge 50

Cost of Usage 51

Pay as You Use 51

Bundled Offer 51

Burstable Shared Trunks 52

Cost of Spike Calls 53

Cost of Security 53

Cost of Expertise/Knowledge 54

Other Areas of Costs and Savings 54

Summary 55

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