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Avaya 4600 Series Voice Coding Standards , H.323 Standard , DHCP , TFTP

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Overview of Voice over IP (VoIP)

Overview of Voice over IP

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Voice Coding Standards 2

There are a number of voice coding standards. The Avaya 4600 Series IP Telephones offer the

options described below.

G.711, which describes the 64 kbps PCM voice coding technique. G.711-encoded voice is

already in the correct format for digital voice delivery in the public phone network or through

PBXs.

G.729A and G.729B, which describe adaptive code-excited linear-predictive (CELP)

compression that enables voice to be coded into 8 kbps streams.

Release 1.6 of the 4600 Series IP Telephones provides support for G.711 silence suppression and

custom packet loss concealment, which can improve audio quality significantly.

H.323 Standard 2

Internal signaling provides connection control and call progress (status) information. The H.323

standard is used for internal signaling for IP packet voice networks. H.323 defines more than

simply voice. It defines a complete multimedia network (voice, video, data), with everything from

devices to protocols. The H.245 standard links all the entities within H.323 by negotiating facilities

among participants and H.323 network elements.

The H.323 standard makes G.711 PCM compression the default form of compression. All other

compression formats are optional.

DHCP 2

Dynamic Host Configuration Protocol (DHCP) allows a server to assign IP addresses and other

parameters to devices such as the 4600 Series IP Telephones on an as-needed basis. This

eliminates the need to configure each end station with a static IP address. The DHCP application

also passes information to the 4600 Series IP Telephone, identifying the IP Addresses of the PBX

and the TFTP server and the path to the upgrade script and the application file on the TFTP server.

For further information, refer to DHCP and TFTP Servers on page 2-7 and DHCP on page 4-6.

TFTP 2

During the installation and, if necessary, during the reset of the 4600 Series IP Telephones, the

upgrade script and potentially, the application file, are downloaded from the Trivial File Transfer

Protocol (TFTP) server to each IP Telephone, simplifying the software upgrade process. For

further information, refer to DHCP and TFTP Servers on page 2-7 and TFTP on page 4-17.

Contents

Main Page Page Page 4600 Series IP Telephone LAN Administrators Guide Table of Contents 1 Introduction 2 Overview of Voice over IP (VoIP) 3 Requirements 4 Server Administration 5 Troubleshooting Guidelines Appendix A: Avaya - 46xx IP Telephone MIB Appendix B: Creating Websites for the 4630 IP Telephone Appendix C: Creating Websites for the 4620 IP Telephone Introduction About This Guide Intended Audience Document Organization Change History Terms Used in This Guide Conventions Used in This Guide Symbolic Conventions Typographic Conventions Online Documentation Related Documents IETF Documents ITU Documents ISO/IEC, ANSI/IEEE Documents Customer Support Overview of Voice over IP (V oIP) Introduction Overview of Voice over IP Data and Voice Network Similarities Delay and Jitter Tandem Coding Voice Coding Standards H.323 Standard DHCP TFTP NAT SNMP Network Assessment Suggestions for Installation and Configuration 2 Reliability and Performance IP Address Lists and Station Number Portability Security 4600 Series IP Telephones Dual Connection Architecture Single Connection Architecture Registration and Authentication Software Initialization Process Step 1: Telephone to Network Step 2: DHCP Server to Telephone Step 3: Telephone and TFTP Server Step 4: Telephone and the DEFINITY/MultiVantageTM Call Server Page Requirements Introduction Hardware Requirements Page Software Requirements WARNIN G: Page Server Administration Introduction Page Page Administering 4600 Series IP Telephones on DEFINITY/MultiVantage Servers 4 DEFINITY Release 8.4 4 DEFINITY Releases 9, 9.5, 10, and MultiVantageTM Release 11 DHCP and TFTP Software Checklist Required Network Information DHCP Choosing a DHCP Configuration DHCP Software Alternatives DHCP Generic Setup Page Windows NT 4.0 DHCP Server Verifying the Installation of the DHCP Server Initial Configuration Creating a DHCP Scope for the IP Telephones Editing Custom Options Adding the DHCP Option Activating the Leases Verifying Your Configuration Verify the Default Option, 176 46XXOPTION 4 Verify the Scope Option, 176 46XXOPTION Verify the Global Option, 176 46XXOPTION Windows 2000 DHCP Server Verifying the Installation of the DHCP Server Creating and Configuring a DHCP Scope Page Adding DHCP Options Activating the New Scope TFTP TFTP Generic Setup Avaya TFTP (Suite Pro) Configuration 4600 Series IP Telephone Scripts and Application Files Contents of the Upgrade Script QoS IEEE 802.1D and 802.1Q WARNI NG: DIFFSERV UDP Port Selection QoS with 4620 and 4630 IP Telephones RSVP and RTCP Administering Options for the 4600 Series IP Tel ep ho ne s DNS Addressing Customizing the Site-Specific Option Number (SSON) Entering Options via the Telephone Dialpad Customizing the 4630 IP Telephone Page Page Page 4630 Backup/Restore Page Call Log Archive Customizing the 4620 IP Telephone Page Page Troubleshooting Guidelines Error Conditions Page Page Page Page Page Page The View Administrative Option Error Messages Page Page Page Page Page A Appendix A: Avaya - 46xx IP Telephone MIB Avaya - 46xx IP T elephone MIB Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page B Appendix B: Creating Websites for the 4630 IP Telephone General Background Browser Features and Behavior Document Skeleton Content-Based Style Logical Style Physical Style Physical Spacing and Layout Lists and Tables Lists Tabl es Images Links Frames Forms Character Entities Colors Fonts Cookies Design Guidelines Fixed-Width Objects Images Frames Fonts Maintaining Context User Interaction C Appendix C: Creating Websites for the 4620 IP Telephone General Background WML Document Skeleton Page Text Elements Text Formatting T ags Anchor Elements Image Elements Event Elements Page Page Task Elements Input Elements Page Page Variable Elements Character Entities Colors and Fonts Summary Of WML Tags And Attributes 5