IP Telephony: Cisco CallManager Release 3.0(5)

SOLUTION REFERENCE NETWORK DESIGN Cisco AVVID Solution IP Telephony: Cisco CallManager Release 3.0(5) Cisco Confidential All contents are Copyright © 1992–2001 Cisco Systems, Inc All rights reserved Important Notices and Privacy Statement THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB’s public domain version of the UNIX operating system All rights reserved Copyright © 1981, Regents of the University of California NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS” WITH ALL FAULTS CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES AtmDirector, Browse with Me, CCDA, CCDE, CCDP, CCIE, CCNA, CCNP, CCSI, CD-PAC, CiscoLink, the Cisco NetWorks logo, the Cisco Powered Network logo, Cisco Systems Networking Academy, the Cisco Systems Networking Academy logo, Fast Step, Follow Me Browsing, FormShare,FrameShare, GigaStack, IGX, Internet Quotient, IP/VC, iQ Breakthrough, iQ Expertise, iQ FastTrack, the iQ Logo, iQ Net Readiness Scorecard, MGX, the Networkers logo, Packet, PIX, RateMUX, ScriptShare, SlideCast, SMARTnet, TransPath, Voice LAN, Wavelength Router, WebViewer are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn, Empowering the Internet Generation, are service marks of Cisco Systems, Inc.; and Aironet, ASIST, BPX, Catalyst, Cisco, the Cisco Certified Internetwork Expert Logo, Cisco IOS, the Cisco IOS logo, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Enterprise/Solver, EtherChannel, EtherSwitch, FastHub, IOS, IP/TV, LightStream, Post-Routing, Pre-Routing, Registrar, StrataView Plus, Stratm, SwitchProbe, TeleRouter, and VCO are registered trademarks of Cisco Systems, Inc or its affiliates in the U.S and certain other countries All other brands, names, or trademarks mentioned in this document or Web site are the property of their respective owners The use of the word partner does not imply a partnership relationship between Cisco and any other company (0011R) Cisco IP Telephony Solution Reference Network Design Copyright © 2000, 2001, Cisco Systems, Inc All rights reserved C O N T E N T S Preface xi Purpose xi Audience xii Organization xii Revision History xiv Conventions xv Additional Information xvii Obtaining Documentation xviii World Wide Web xviii Documentation CD-ROM xviii Ordering Documentation xviii Documentation Feedback xix Obtaining Technical Assistance xix Cisco.com xix Technical Assistance Center xx Contacting TAC by Using the Cisco TAC Website xx Contacting TAC by Telephone xxi CHAPTER Introduction 1-1 General Design Models 1-1 Single-Site Model 1-3 Multiple Sites with Independent Call Processing 1-5 Cisco IP Telephony Network Design Guide 78-11103-03 iii Contents Multisite IP WAN with Distributed Call Processing 1-7 Multisite IP WAN with Centralized Call Processing 1-10 CHAPTER Campus Infrastructure Considerations 2-1 Overview 2-2 Power Protection Strategies 2-4 Network Infrastructure 2-5 High Availability 2-7 Physical Connectivity Options 2-9 Power to IP Phones 2-10 Inline Power 2-10 Establishing Power to the IP Phone 2-12 Inline Power Configuration 2-13 Other Inline Power Considerations 2-15 External Patch Panel Power 2-17 Wall Power 2-20 Summary of Recommendations 2-20 IP Addressing and Management 2-21 CDP Enhancements 2-22 VVID Field 2-22 Trigger Field 2-22 Power Requirement Field 2-23 Auxiliary VLANs and Data VLANs 2-23 Voice VLAN Configuration 2-24 Connecting to the Network 2-25 Sample Addressing Plan and Recommendations 2-26 Cisco IP Telephony Network Design Guide iv 78-11103-03 Contents Quality of Service 2-28 Traffic Classification Types 2-28 Trust Boundaries 2-29 Traffic Classification at Layer 2-30 Traffic Classification at Layer 2-34 Layer Traffic Classification on the Cisco Catalyst 6000 2-34 Summary of Capabilities and Recommendations 2-36 CHAPTER Cisco CallManager Clusters 3-1 Cluster Operation and Scalability Guidelines 3-1 Device Weights 3-3 Intracluster Communication 3-5 Cisco CallManager Redundancy 3-6 Redundancy Group Configurations 3-6 Device Pool Configuration 3-9 Campus Clustering Guidelines 3-12 Intercluster Communication 3-14 Cluster Provisioning for the Campus 3-14 Clusters for Multisite WAN with Distributed Call Processing 3-15 Clusters for Multisite WAN with Centralized Call Processing 3-18 Intracluster and Intercluster Feature Transparency 3-21 Cisco IP Telephony Network Design Guide 78-11103-03 v Contents CHAPTER Gateway Selection 4-1 Supported Protocols 4-2 DTMF Relay 4-3 Skinny Gateways 4-4 Cisco IOS H.323 Gateways 4-4 MGCP Gateway 4-4 Cisco CallManager Redundancy 4-5 Skinny Gateways 4-5 IOS H.323 Gateways 4-5 MGCP Gateway 4-6 Supplementary Services 4-7 Skinny Gateways 4-7 IOS H.323 Gateways 4-8 MGCP Gateway 4-9 Site-Specific Gateway Requirements 4-9 CHAPTER Dial Plan Architecture and Configuration 5-1 Cisco CallManager Dial Plan Architecture 5-1 Route Pattern 5-6 Route List 5-7 Route Group 5-7 Devices 5-8 Digit Translation Tables 5-9 Special Dial String Considerations 5-10 On-Net Route Pattern 5-11 Outbound Calls Through the PSTN 5-12 Cisco IP Telephony Network Design Guide vi 78-11103-03 Contents Configuring Dial Plan Groups and Calling Restrictions 5-14 Partitions 5-15 Calling Search Space 5-15 Dial Plan Guidelines and Configuration 5-18 Campus and Individual Site Dial Plans 5-19 Multi-Site WAN Dial Plans 5-21 The Role of a Gatekeeper 5-21 CHAPTER Multisite WAN with Distributed Call Processing 6-1 Distributed Call Processing Model 6-1 Call Admission Control 6-3 Operational Model 6-8 Gatekeeper Configuration 6-9 Cisco CallManager Configuration 6-10 Interaction Between Cisco CallManager and Gatekeeper 6-11 Considerations for Using a Gatekeeper 6-15 Dial Plan Considerations 6-15 Using Cisco CallManager to Route Calls 6-17 Using the Gatekeeper to Route Calls 6-19 Cisco CallManager Configuration 6-22 Gatekeeper Configuration 6-27 Gatekeeper Selection and Redundancy 6-28 Configuring Dialing Restrictions 6-28 Bandwidth Consumption of Dialed Numbers 6-28 Cisco CallManager Cluster Considerations 6-30 DSP Resource Provisioning for Transcoding and Conferencing 6-30 Voice Messaging Considerations 6-32 Cisco IP Telephony Network Design Guide 78-11103-03 vii Contents CHAPTER Multisite WAN with Centralized Call Processing 7-1 Centralized Call Processing Model 7-1 Call Admission Control 7-3 Caveats for Locations-Based Call Admission Control 7-4 Dial Plan Considerations 7-5 Interlocation Calls 7-5 Intercluster Calls 7-6 Local PSTN Calls 7-6 Design Example 7-6 Cisco CallManager Cluster Considerations 7-8 DSP Resource Provisioning for Transcoding and Conferencing 7-10 Voice Messaging Considerations 7-12 CHAPTER Quality of Service 8-1 Campus QoS Model 8-1 Traffic Classification 8-2 Interface Queuing 8-2 WAN QoS Model 8-4 WAN Provisioning 8-4 WAN QoS Tools 8-5 Traffic Prioritization 8-5 Link Efficiency Techniques 8-7 Traffic Shaping 8-9 Best Practices 8-10 Call Admission Control 8-11 Cisco IP Telephony Network Design Guide viii 78-11103-03 Contents CHAPTER Catalyst DSP Provisioning 9-1 Understanding the Catalyst DSP Resources 9-2 Catalyst Conferencing Services 9-4 Conferencing Design Details 9-4 Conferencing Caveats 9-6 Catalyst MTP Transcoding Services 9-7 MTP Transcoding Design Details 9-7 IP-to-IP Packet Transcoding and Voice Compression 9-7 Voice Compression, IP-to-IP Packet Transcoding, and Conferencing 9-9 IP-to-IP Packet Transcoding Across Intercluster Trunks 9-10 MTP Transcoding Caveats 9-12 Catalyst 4000 Voice Services 9-13 Catalyst 6000 Voice Services 9-15 CHAPTER 10 Migrating to an IP Telephony Network 10-1 Network Models 10-1 PBX and Voice Messaging Interfaces and Protocols 10-2 Simple IP Network Migration Sequence 10-3 Reference Models for Migration Configurations 10-6 Detailed Discussion of Model A 10-7 Detailed Discussion of Model B 10-12 Detailed Discussion of Model C 10-15 Detailed Discussion of Model D 10-18 Cisco Digital PBX Adapter (DPA) 10-20 Understanding How the DPA 7630 Works 10-21 Why is the DPA 7630 Needed? 10-21 Cisco IP Telephony Network Design Guide 78-11103-03 ix Contents Can I Just Use SMDI? 10-21 What If I Cannot Use SMDI? 10-22 Choosing an Integration Mode 10-22 Using the Simple Integration Mode 10-23 Using the Hybrid Integration Mode 10-24 Using the Multiple Integration Mode 10-25 CHAPTER 11 Network Management 11-1 Remote Serviceability for Cisco CallManager 11-1 SNMP Instrumentation on the Cisco CallManager Server 11-2 System Logging Components 11-3 Syslog Collector 11-4 Syslog Administrative Interface 11-6 CiscoWorks2000 Voice Management Features 11-8 Campus Manager 11-11 User Tracking 11-12 Trace Path Analysis 11-13 Resource Manager Essentials 11-15 Inventory Control and Reporting 11-15 System Logging Management 11-16 Syslog Message Filtering 11-18 Alarms 11-19 GLOSSARY INDEX Cisco IP Telephony Network Design Guide x 78-11103-03 ... customers are aggressively pursuing Cisco solutions for both large and small networks Solutions based on Cisco CallManager Release 3.0(5) allow Cisco to deliver large-scale IP telephony systems with many... Processing systems using Cisco CallManager Release 3.0(5) for distributed call processing Cisco IP Telephony Network Design Guide xii 78-11103-03 Preface Organization Chapter Title Description Chapter... Configuration 6-9 Cisco CallManager Configuration 6-10 Interaction Between Cisco CallManager and Gatekeeper 6-11 Considerations for Using a Gatekeeper 6-15 Dial Plan Considerations 6-15 Using Cisco CallManager