Cisco Systems UBR924 Voice over IP Configurations

CHAPTER

4-1

CiscouBR924 Software Configuration Guide

OL-0337-05 (8/2002)

4

Voice over IP Configurations

This chapter provides an overview of Voice over IP (VoIP) operations on the Cisco uBR924 cable access

router. It also describes how to configure the Cisco uBR924 router for basic VoIP operation in both

bridging and routing modes. This chapter contains the foll owing sections:

•Overview

•H.323v2 Static Bridging Configuration

•H.323v2 Static Routing Configuration

•H.323v2 Dynamic Mapping Configuration

•SGCP Configuration

•MGCP Configuration

Note The configurations shown in this chapter can be combined with most of the data-only configurations

shown in Chapter3, “Advanced Data-Only Configurations.” All voice configurations assume that the

CMTS and associated servers, gateways, and gatekeepers have been configured accordingly.

Overview

When using a CiscoIOS image that contains voice support, the Cisco uBR924 cable access router

supports Voice over IP (VoIP), which transmits voice and fax calls over a TCP/IP network such as the

Internet. Depending on the services purchased from the cable service provider, subscribers can place and

receive calls without using the local telco exchange carrier.

The Ciscou BR924 router has two voice ports that support two simultaneous voice and fax calls from

each subscriber site, but multiple telephones and fax devices can be connected to each of the two VoIP

telephone lines (provided that the 5 REN limit for each t elephone line is not exceeded). Telephones at

each subscriber site must support touch-tone dialing; rotary dialing is not supported. Special telephone

features such as call waiting, forwarding, and conferen cing are supported only when using Cisco IOS

images that support those features.

Note Fax devices—standard Group III and computer-based Group III machines up to 14,400 baud—are

supported in Cisco IOS Release 12.0(5)T and higher images that support VoIP. However, in general,

fax/modem cards are not supported over VoIP links. You must be using a Cisco IOS image that supports

voice and have purchased the appropriate feature license before being able to make voice calls using the

Cisco uBR924 router.

Contents

Main Cisco uBR924 Cable Access Router Software Configuration Guide Page CONTENTS Page Page Page Preface Audience Purpose Organization Document Conventions Page x loss of data. this guide. paragraph. Acronyms and Terms Related Documentation Cisco uBR924 Cable Access Router CMTS Hardware Installation Publications Cisco IOS Publications Configuration Editor and Network Management Publications Subscriber Publications Obtaining Documentation World Wide Web Documentation CD-ROM Ordering Documentation Obtaining Technical Assistance Technical Assistance Center Documentation Feedback Page Overview Cisco IOS Software Release Feature Sets Base IP DOCSIS-Compliant Bridging Home Office (Easy IP) Value Telecommuter Performance Telecommuter Value Small and Branch Office Performance Small and Branch Office Feature Descriptions Cable Monitor Web Diagnostics Tool Cisco Cable Clock Card Support Cisco IOS Firewall DOCSIS-Compliant Bridging DOCSIS Baseline Privacy Interface Dynamic Host Configuration Protocol Server Dynamic Host Configuration Protocol Proxy Support Enhanced IP Bridging Ecosystem Gatekeeper Interoperability Enhancements Fax over IP H.323v2 (Gateway/Gatekeeper) IP Address Negotiation IPsec Network Security Layer 2 Tunneling Protocol Media Gateway Control Protocol V12.1.3T NetRanger SupportCisco IOS Intrusion Detection Network Address Translation and Port Address Translation Network Address Translation Support for NetMeeting Directory (Internet Locator Service) Quality of Service Quality of ServiceDOCSIS 1.0+ Extensions Routing Information Protocol Version 2 Secure Shell Version 1 Simple Gateway Control Protocol Triple Data Encryption Standard VPN IPsec EnhancementDynamic Crypto Map Initial Provisioning Supporting Multiple Classes of Service DOCSIS 1.0 Static Profiles DOCSIS 1.0+ and 1.1 Dynamic Profiles Creating Multiple Profiles User Registrar Modem Registrar Cisco Network Registrar Access Registrar Page DOCSIS-Bridging Configuration DHCP Server Configuration DOCSIS Configuration File Page Page Cisco IOS Software Image Cisco IOS Configuration File Using the Vendor-Specific Information Field 2-8 Sample Configuration for DOCSIS-Compliant Bridging This configuration shows the following requirements for DOCSIS-compliant br idging: Configuring the Attached CPE Devices Reconfiguring DOCSIS-Compliant Bridging Page Advanced Data-Only Configurations Data-Only Routing Page Routing with DHCP Server 3-5 NAT/PAT Configuration Page NAT/PAT Configuration with DHCP Proxy Page Using NAT and DHCP Proxy and Copying Configuration Files IPSec (56-bit) Example Page Sample Configuration 3-14 56-bit DES-CBC encryption (the default) MD5 (HMAC variant) hash algorithm Pre-shared authentication keys 768-bit Diffie-Hellman group (the default) Additional Documentation IPSec (3DES) Example L2TP Example Page 3-19 Page Voice over IP Configurations Overview Introduction Page Voice Handling Quality of Service Support H.323v2 Protocol SGCP and MGCP Protocol Stack H.323v2 Static Bridging Configuration Page 4-9 H.323v2 Static Routing Configuration 4-11 routing mode. H.323v2 Dynamic Mapping Configuration Note The Cisco uBR924 router can use H.323v2 dynamic mapping in either DOCSIS-bridging mode or Page Page Page SGCP Configuration Page 4-17 MGCP Configuration Page 4-20 Command Purpose Step22 uBR924# copy running-config startup-config Step23 uBR924# show startup-config Display the configuration file that was just created. Building configuration... 4-21 Page A Using Cisco IOS Software Accessing the Routers Command-Line Interface Connecting Using Telnet Connecting to the Console Port Understanding the Command-Line Interface Command Modes User EXEC Mode Privileged EXEC Mode Global Configuration Mode Interface Configuration Mode Context-Sensitive Help Command History Features Displaying the Command History Editing Previous Commands Command History Buffer Size Using Output Modifiers Understanding Cisco IOS Configuration Files Downloading the Configuration File Startup and Run-Time Configuration Files Displaying the Configuration Files File Format Useful Commands Page B Using the Cable Monitor Tool Enabling the Cable Monitor Configuration Modes Security Considerations Disabling the Cable Monitor Accessing the Cable Monitor Through the Cable Interface when the Cable Interface is Operational Through the Ethernet Interface when the Cable Interface is Not Operational Sample Pages Page Home Page Page Initialization Information Page Page Voice Ports Information Page CPE State Information Page Cable Interface Information Page Performance Information Page Debug Information Page Page C Using the ROM Monitor Entering the ROM Monitor Command Conventions Commands Page Page Page Page D New and Changed Commands Reference Commands Reserved for DOCSIS Use Page INDEX Symbols Numerics A D E F G H I L O P Q R U V