VoIP Cisco Introduction to IP Telephony.pdf

Cisco Technical Solution Series:

IP Telephony Solution Guide

Version 2.1

October 2001

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Cisco Technical Solution Series: IP Telephony Solution Guide

Contents

CHAPTER 1

Introduction to IP Telephony 1-1

Overview 1-1

Organization 1-1

Audience 1-2

Scope 1-2

Revision History 1-2

Related Information 1-3

CHAPTER 2

IP Telephony Architecture Overview 2-1

CHAPTER 3

Planning the IP Telephony Network 3-1

In this Chapter 3-1

Related Information 3-1

Evaluating and Documenting the Existing Data Infrastructure 3-1

LAN/Campus Environment 3-2

WAN Environment 3-7

Evaluating and Documenting the Existing Telecom Infrastructure 3-10

Examining the Existing Telecom Topology 3-11

Examining PBX and Key Systems 3-12

Examining Voice Mail Systems 3-12

Examining Voice Trunking 3-12

Phones per Site and Phone Features 3-17

Examining the Existing Dial Plan 3-17

Fax Requirements 3-21

Evaluating and Documenting the Existing Power/Cabling Infrastructure 3-21

Data Center Power Requirements 3-22

Wiring Closet Power 3-23

IP Telephony Availability Requirements 3-24

Hardware Reliability 3-25

Software Reliability 3-26

Link/Carrier Availability 3-27

Power/Environment 3-29

Network Design 3-31

User Error and Process 3-33

Planning for WAN Deployments 3-34

Collecting Information on the Current WAN Environment 3-34

Determining Voice Bandwidth Requirements 3-38

Analyzing Upgrade Requirements 3-41

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Performing Upgrades and Implementing Tuning 3-43

Assessing Results 3-43

Operational Turnover and Production 3-44

Operations and Implementation Planning 3-44

IP Telephony Capacity Planning 3-44

Solution Manageability Requirements 3-48

Staffing and Expertise Requirements 3-51

Operations Support Plan 3-56

CHAPTER 4

Designing the IP Telephony Network 4-1

In this Chapter 4-1

Related Information 4-1

Overview 4-2

Introduction to IP Telephony Design 4-2

Designing the Campus Infrastructure 4-2

Designing for LAN/WAN QoS 4-2

The Importance of QoS 4-2

Connecting the IP Phone 4-8

Enabling the High Speed Campus 4-17

Building a Branch Office 4-42

Enabling the Wide Area Network 4-47

Summary 4-72

Designing Cisco CallManager Clusters 4-73

Selecting Gateways 4-73

Dial Plan Architecture and Configuration 4-73

Designing a Multi-site WAN with Distributed Call Processing 4-73

Designing a Multi-site WAN with Centralized Call Processing 4-73

Catalyst DSP Provisioning 4-73

Cisco Packet Fax and Modem Support Guidelines 4-73

Cisco IOS VoIP Router Gateways 4-74

Cisco VG200 4-75

Catalyst 6000 VoIP Gateways 4-76

DT-24+/DT-30+ Gateways 4-77

Future T.38 Fax-relay Support 4-77

E911 and 911 Emergency Services 4-78

Today’s E9-1-1 Service 4-78

IP Telephony Emergency Call Support 4-81

Security Considerations for IP Telephony Networks 4-86

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Infrastructure Security Best Practices 4-87

Securing CallManager Servers 4-95

Integrating Voice Mail 4-107

Voice Messaging with Cisco uOne 4.1E 4-107

Integrating SMDI Voice Mail 4-108

Integrating SMDI Voice Mail Over IP WAN 4-139

Migrating to an IP Telephony Network 4-142

CHAPTER 5

Implementing the IP Telephony Network 5-1

In this Chapter 5-1

Related Information 5-1

Preparing for Implementation 5-2

General Site Information 5-2

Conducting the Site Survey 5-7

Site Survey Tables 5-7

Determining Site Requirements 5-9

LAN Requirements 5-9

WAN Requirements 5-10

Validating Implementation Readiness 5-18

Solution Design Review 5-19

Network Topology Analysis 5-19

Voice Network Analysis 5-19

Data Network Analysis 5-20

Solution Implementation Templates 5-24

Customer Ordered Equipment 5-30

Customer Premises Equipment (CPE) Interface 5-31

Customer Site Readiness 5-31

Implementing the Solution 5-31

Unpacking the Equipment 5-32

Verifying Cabinet Power Feeds, Rails, and Earthing 5-32

Physically Installing Equipment in Cabinet 5-32

Recording Equipment Serial Numbers 5-33

Verifying Equipment Slot Allocations 5-33

Installing Intra-Cabinet Power Cables 5-33

Installing Intra- and Inter-Cabinet Communications Cables 5-33

Verifying Circuit Termination in Customer Patch Panel 5-33

Powering Up Cisco Equipment 5-34

Verifying and Loading System Software and Firmware 5-34

Configuring the Equipment 5-34

Cisco Technical Solution Series: IP Telephony Solution Guide

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