Introduction, Overview of Voice over IP | Avaya 4600 Series specification

Overview of Voice over IP (VoIP)	2
Overview of Voice over IP (VoIP)

Introduction

This chapter describes the differences between data and voice networks, and the factors that influence the performance of VoIP. The installation and administration of 4600 Series IP Telephones on DEFINITY® servers, and the installation and configuration of DHCP and TFTP are addressed.

Overview of Voice over IP

The 4600 Series IP Telephones allow enterprises to use Voice over IP (that is, packet-switched networks) instead of telephony over the Public Switched Telephone Network (PSTN). However, the use of data networks for transmitting voice packets poses the problem that data networks were not designed for the specific qualities required by voice traffic.

Data and Voice Network Similarities

Data and voice networks share similar functions due to the nature of networking.

■Signaling is used to establish a connection between two endpoints.

In a voice network, signaling is used to identify who the calling party is trying to call and where the called party is on the network. Traditional telephony uses terminals with fixed addresses and establishes a fixed connection for the communication session between two such terminals, allocating fixed bandwidth resources for the duration of the call.

IP communications constitute a connectionless network, having neither fixed addresses nor fixed connections.

■Addressing. Each terminal on a network must be identified by a unique address.

In a voice network the unique address is a permanent attribute, based on international and national numbering plans, as well as those based on local telephone company practices and internal customer-specific codes.

In IP communications, dial plans track extension numbers assigned to terminals. No fixed connection path is needed.

Introduction

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Avaya 4600 Series manual Introduction, Overview of Voice over IP, Data and Voice Network Similarities

Contents

Series IP Telephone Page Avaya Web Obtaining Products European Union Declaration of Conformity Table of Contents Series IP Telephone LAN Administrator’s Guide Requirements Troubleshooting Guidelines Appendix C Creating Websites for the 4620 IP Telephone Intended Audience About This Guide Change History Document Organization ARP Terms Used in This Guide Typographic Conventions Symbolic ConventionsConventions Used in This Guide Definity Documentation Release Online Documentation Related Documents IP Telephone User Guide 555-233-765 Int’l Ietf Documents ITU Documents ISO/IEC, ANSI/IEEE Documents Customer Support Data and Voice Network Similarities IntroductionOverview of Voice over IP Tandem Coding Delay and Jitter Standard Voice Coding Standards QoS NAT Reliability and Performance Suggestions for Installation and ConfigurationNetwork Assessment Security IP Address Lists and Station Number Portability Series IP Telephones Dhcp Server to Telephone Initialization ProcessTelephone to Network Telephone and the Definity /MultiVantageTM Call Server Telephone and Tftp ServerPage Hardware Requirements Requirements Refer to the 4600 Series IP Telephone Installation Guide Software Requirements Sample Configuration Using 4600 Series IP Telephones Server Administration Vlan Dhcp Sson Dhcp 4600 IP Telephone Installation Guide Definity Releases 9, 9.5, 10, and MultiVantageTM Dhcp and TftpDefinity Release Required Network Information Software Checklist Dhcp Software Alternatives Choosing a Dhcp Configuration Dhcp Generic Setup Dhcp Initial Configuration Verifying the Installation of the Dhcp ServerDhcpack Setting of System Values Set to Select Start-Settings-Control Panel Creating a Dhcp Scope for the IP Telephones Select Start-Programs-Admin Tools-DHCP ManagerSelect Scope-Create Example Editing Custom Options Select Dhcp Options-Defaults in the menuAdding the Dhcp Option Click Edit Array Verify the Default Option, 176 46XXOPTION Verifying Your ConfigurationSelect Defaults from the DHCPOptions menu Activating the Leases Select Start-Programs-Administrative Tools-DHCP Creating and Configuring a Dhcp ScopeWindows 2000 Dhcp Server Verify the Global Option, 176 46XXOPTION Example Adding Dhcp Options Activating the New Scope Configuration Tftp Generic SetupAvaya Tftp Suite Pro Tftp Series IP Telephone Scripts Application Files Select System-Setup Contents of the Upgrade Script Ieee 802.1D and 802.1Q QoS Diffserv Parameter Possible Values UDP Port SelectionQoS with 4620 and 4630 IP Telephones Rsvp and Rtcp DNS Addressing Administering Options for the 4600 Series IP Telephones Entering Options via the Telephone Dialpad Customizing the Site-Specific Option Number Sson L2QVLAN Customizing the 4630 IP TelephoneMcport PHY2STAT Directory Application Parameters Voice Mail Application Parameters Parameter Name Default Value Status RangeStock Ticker Application Parameters Web Access Application Parameters Backup/Restore Parameters Backup/RestoreWebcoding Ascii Ftpsrvr Setting/Parameter Name Type Customizing the 4620 IP Telephone Call Log Archive Wmlproxy WmlhomeWmlexcept Wmlport Wmlcoding Ascii Error Conditions Troubleshooting Guidelines Series IP Telephone LAN Administrator’s Guide Resolution As above Resolution Use the softkey Menu Resolution Series IP Telephone LAN Administrator’s Guide Refer to of the 4600 Series IP Telephone Installation Guide Mute 8 4 3 9 # Mute V I E W # View Administrative Option Filename2.exe Error Messages Detailed in the 4600 Series IP Telephone Installation Guide During Registration Series IP Telephone LAN Administrator’s Guide Troubleshooting Guidelines Series IP Telephone LAN Administrator’s Guide Error Messages Definitions = Begin Imports LAST-UPDATEDFrom RFC1213-MIB Organization Status OBJECT-TYPESyntax Page Syntax Octet String Page Page Page Page Page Page Page Page Page Page Page Page Page Stored in NVM. = endptNVM Page Page Page Syntax Integer Status Page Syntax Octet String Audio, currently in use. = endptDEFINITY Page Page Syntax Integer Obsolete Avaya 46xx IP Telephone MIB EndptDIRSRVR OBJECT-TYPE Syntax Integer Page EndptFTPSRVR Syntax Integer Page Avaya 46xx IP Telephone MIB EndptWEBPROXY OBJECT-TYPE Page Page Syntax Octet String END Page General Background Appendix B Creating Websites for the 4630 IP Telephone Document Skeleton Browser Features and Behavior Content-Based Style Physical Style Logical Style Lists Physical Spacing and LayoutLists and Tables Tables Links Images Forms Frames Fonts Character EntitiesColors Fixed-Width Objects Design GuidelinesCookies Images User Interaction Maintaining Context Appendix C Creating Websites for the 4620 IP Telephone Attribute WML Document SkeletonComments Not Supported Onenterbackward Url Occurs when the user Supported Text ElementsAttribute Value Description Comments Anchor Elements Text Formatting Tags Px pixel Image Elements Type Description Comments Event Elements Type Default Label if no label Specified Event Permitted Tags Description Required Supported Task Elements Nmtoken Input Elements Number Sets a title for Variable Elements Character Entities Description Symbol Numeric Entity Name Entity Tag Attribute Supported? Colors and FontsSummary Of WML Tags And Attributes Align Alt Ivalue