Voice Coding Standards | Avaya 4600 Series guide

Overview of Voice over IP (VoIP)

Voice Coding Standards

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

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

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 2-7and DHCP on page 4-6.

TFTP

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 2-7and TFTP on page 4-17.

Overview of Voice over IP

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Avaya 4600 Series manual Voice Coding Standards

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 Conventions Used in This Guide Symbolic ConventionsTypographic Conventions 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 Overview of Voice over IP IntroductionData and Voice Network Similarities Tandem Coding Delay and Jitter Standard Voice Coding Standards QoS NAT Network Assessment Suggestions for Installation and ConfigurationReliability and Performance Security IP Address Lists and Station Number Portability Series IP Telephones Telephone to Network Initialization ProcessDhcp Server to Telephone 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 Release Dhcp and TftpDefinity Releases 9, 9.5, 10, and MultiVantageTM Required Network Information Software Checklist Dhcp Software Alternatives Choosing a Dhcp Configuration Dhcp Generic Setup Dhcp Select Start-Settings-Control Panel Verifying the Installation of the Dhcp ServerInitial Configuration Dhcpack Setting of System Values Set to Example Select Start-Programs-Admin Tools-DHCP ManagerCreating a Dhcp Scope for the IP Telephones Select Scope-Create Click Edit Array Select Dhcp Options-Defaults in the menuEditing Custom Options Adding the Dhcp Option Activating the Leases Verifying Your ConfigurationVerify the Default Option, 176 46XXOPTION Select Defaults from the DHCPOptions menu Verify the Global Option, 176 46XXOPTION Creating and Configuring a Dhcp ScopeSelect Start-Programs-Administrative Tools-DHCP Windows 2000 Dhcp Server Example Adding Dhcp Options Activating the New Scope Tftp Tftp Generic SetupConfiguration Avaya Tftp Suite Pro Series IP Telephone Scripts Application Files Select System-Setup Contents of the Upgrade Script Ieee 802.1D and 802.1Q QoS Diffserv QoS with 4620 and 4630 IP Telephones UDP Port SelectionParameter Possible Values 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 PHY2STAT Customizing the 4630 IP TelephoneL2QVLAN Mcport Directory Application Parameters Stock Ticker Application Parameters Parameter Name Default Value Status RangeVoice Mail Application Parameters Web Access Application Parameters Ftpsrvr Backup/RestoreBackup/Restore Parameters Webcoding Ascii Setting/Parameter Name Type Customizing the 4620 IP Telephone Call Log Archive Wmlport WmlhomeWmlproxy Wmlexcept 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 Organization LAST-UPDATEDDefinitions = Begin Imports From RFC1213-MIB Syntax OBJECT-TYPEStatus 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 and Tables Physical Spacing and LayoutLists Tables Links Images Forms Frames Colors Character EntitiesFonts Cookies Design GuidelinesFixed-Width Objects Images User Interaction Maintaining Context Appendix C Creating Websites for the 4620 IP Telephone Not Supported WML Document SkeletonAttribute Comments Onenterbackward Url Occurs when the user Attribute Value Description Comments Text ElementsSupported 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 Summary Of WML Tags And Attributes Colors and FontsTag Attribute Supported? Align Alt Ivalue