Cisco IP Video Telephony Solution Reference Network Design (SRND) Cisco CallManager Release 4.0 July 2004 Corporate Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 526-4100 Customer Order Number: 9562740406 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. 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CONTENTS Preface vii New or Changed Information for This Release vii Revision History vii Obtaining Documentation viii Cisco.com viii Ordering Documentation viii Documentation Feedback viii Obtaining Technical Assistance ix Cisco Technical Support Website ix Submitting a Service Request ix Definitions of Service Request Severity ix Obtaining Additional Publications and Information x CHAPTER 1 Introduction 1-1 IP Video Telephony Solution Components 1-1 Video Enhancements in Cisco CallManager 4.0 1-2 Protocols 1-2 Administration 1-4 Video Capabilities Per Device 1-4 Video Bandwidth Per Call 1-6 Video Bandwidth Per Location 1-6 Video Conference Bridge Resources 1-7 Serviceability 1-7 CHAPTER 2 Deployment Models 2-1 Single-Site Model 2-1 Multisite Model with Centralized Call Processing 2-2 Multisite Model with Distributed Call Processing 2-4 Cisco IP Video Telephony SRND 9562740406 iii Contents CHAPTER 3 Endpoints 3-1 SCCP Endpoints 3-1 Cisco VT Advantage 3-1 Codecs Supported by VT Advantage 3-3 PC Requirements 3-3 Tandberg SCCP Endpoints (T-1000 and T-550 Models) 3-4 H.323 Clients 3-5 Addressing for H.323 Clients 3-7 IP Address Matching for H.323 Clients 3-7 CHAPTER 4 Call Admission Control 4-1 Bandwidth Requirements 4-1 Media Channels 4-1 Bandwidth Used Per Call 4-2 Call Admission Control Within a Cluster 4-4 Regions 4-4 Locations 4-6 Call Admission Control Between Clusters 4-7 Non-Gatekeeper Controlled Intercluster Trunks 4-7 Gatekeeper-Controlled Intercluster Trunks 4-9 H.225 Gatekeeper-Controlled Trunks 4-9 Gatekeeper Bandwidth Values 4-9 Bandwidth Requests (BRQ) Enabled/Disabled 4-10 Retry Video Call as Audio 4-10 Wait for Far-End to Send TCS 4-12 CHAPTER 5 Quality of Service 5-1 Traffic Classification and Trust 5-2 Scheduling or Queuing 5-4 Queuing in the Campus 5-4 Queuing in the WAN 5-5 Bandwidth Provisioning 5-5 Traffic Shaping 5-5 Compressed RTP (cRTP) 5-5 Link Fragmentation and Interleaving (LFI) 5-6 Cisco IP Video Telephony SRND iv 9562740406 Contents Endpoint QoS Classification 5-6 Cisco VT Advantage with a Cisco IP Phone 5-6 Tandberg SCCP Endpoints 5-7 H.323 Video Endpoints 5-7 ACL and Policing Support 5-8 CHAPTER 6 Gateways 6-1 Routing Inbound Calls from the PSTN 6-3 Routing Outbound Calls to the PSTN 6-4 Automated Alternate Routing (AAR) 6-5 Least-Cost Routing 6-7 ISDN B-Channel Binding, Rollover, and Busy Out 6-7 Inbound Calls 6-8 Outbound Calls 6-9 Configuring the Gateways in Cisco CallManager 6-9 Call Signaling Port Numbers 6-10 Call Signaling Timers 6-10 Voice Gateways Compatibility 6-10 CHAPTER 7 Multipoint Conferencing 7-1 SCCP MCU Resources 7-3 Media Resource Groups and Lists 7-4 H.323 MCU Resources 7-5 Service Templates and Prefixes 7-6 Gatekeeper Registration and Call Routing 7-7 Sizing the MCU 7-7 IVR for Dial-In Conference 7-8 CHAPTER 8 Gatekeepers 8-1 Endpoint Gatekeepers 8-2 Zone Definitions 8-2 Zone Prefixes and Technology Prefixes 8-3 Zone Subnets 8-4 Disabling the Use of Proxy 8-5 Intercluster Trunk Gatekeeper 8-5 Zone Definition and Prefixes 8-5 Bandwidth Management 8-6 Cisco IP Video Telephony SRND 9562740406 v Contents Supported Gatekeeper Platforms 8-6 Gatekeeper Redundancy 8-7 CHAPTER 9 Applications 9-1 CTI Applications 9-1 Cisco Emergency Responder 9-1 Cisco IP Manager Assistant 9-2 Cisco IP Interactive Voice Response and Cisco IP Contact Center 9-2 Cisco Attendant Console 9-2 Cisco Personal Assistant 9-2 Cisco IP SoftPhone 9-3 Collaboration Solutions 9-3 T.120 Application Sharing 9-3 Cisco MeetingPlace 9-3 Wireless Networking Solutions 9-3 Cisco Aironet 802.11b Networking Solutions 9-3 Cisco Wireless IP Phone 7920 9-4 XML Services 9-4 CHAPTER 10 Security 10-1 Separating the Voice and Data VLANs 10-1 IP Phone Security Settings 10-2 Network Address Translation 10-2 Firewalls 10-3 Protecting the Video Infrastructure 10-3 Blocking Unauthorized Video Calls 10-3 I NDEX Cisco IP Video Telephony SRND vi 9562740406 Preface This document provides design considerations and guidelines for implementing Cisco IP Video Telephony solutions based on the Cisco Architecture for Voice, Video, and Integrated Data (AVVID). This document builds upon ideas and concepts presented in the Cisco IP Telephony Solution Reference Network Design (SRND), which is available online at http://cisco.com/go/srnd This document assumes that you are already familiar with the basic terms and concepts presented in the Cisco IP Telephony SRND. To review any of those terms and concepts, refer to the documentation at the preceding URL. New or Changed Information for This Release Unless stated otherwise, the information in this document applies specifically to Cisco CallManager Release 4.0. Table 1 lists the topics that are new in the current release of this document or that have changed significantly from previous releases of Cisco CallManager. Table 1 New or Changed Information for Cisco CallManager Release 4.0 Topic Described in: IP Video Telephony features and capabilities Video Enhancements in Cisco CallManager 4.0, page 1-2 Revision History This document may be updated at any time without notice. You can obtain the latest version of this document online at http://cisco.com/go/srnd Visit this Cisco.com website periodically and check for documentation updates by comparing the revision date on the front title page of your copy with the revision date of the most recent online version at the preceding URL. The following table lists the revision history for this document. Revision Date Comments July, 2004 Initial version of this document for Cisco CallManager Release 4.0. Cisco IP Video Telephony SRND 9562740406 vii Preface Obtaining Documentation Obtaining Documentation Cisco documentation and additional literature are available on Cisco.com. Cisco also provides several ways to obtain technical assistance and other technical resources. These sections explain how to obtain technical information from Cisco Systems. Cisco.com You can access the most current Cisco documentation at this URL: http://www.cisco.com/univercd/home/home.htm You can access the Cisco website at this URL: http://www.cisco.com You can access international Cisco websites at this URL: http://www.cisco.com/public/countries_languages.shtml Ordering Documentation You can find instructions for ordering documentation at this URL: http://www.cisco.com/univercd/cc/td/doc/es_inpck/pdi.htm You can order Cisco documentation in these ways: • Registered Cisco.com users (Cisco direct customers) can order Cisco product documentation from the Ordering tool: http://www.cisco.com/en/US/partner/ordering/index.shtml • Nonregistered Cisco.com users can order documentation through a local account representative by calling Cisco Systems Corporate Headquarters (California, USA) at 408 526-7208 or, elsewhere in North America, by calling 800 553-NETS (6387).