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    Avaya IP Telephony Implementation Guide

    ABSTRACT

    This application note gives implementation guidelines for the Avaya MultiVantage CommunicationsApplications. Configurations and recommendations are given for various Avaya Media Servers andGateways, as well as Avaya 4600 Series IP Telephones. This document also provides information on

    virtual local area networks (VLANs), and guidelines for configuring Avaya and Cisco networkingequipment in VoIP applications.

    The intent of this document is to provide training on IP telephony, and to give guidelines forimplementing Avaya solutions. It is intended to supplement the product documentation, not replace it.

    This document covers the Avaya Communication Manager 2.0 and 2.1, and the Avaya 4600 Series IP

    Telephone 1.8 and 2.0, with limited information regarding previous and future versions.

    External posting: www1.avaya.com/enterprise/resourcelibrary/applicationnotes/eclips_general.html.

    Application Note

    August 2004

    COMPAS ID 95180

    Avaya IP Telephony Implementation GuideCommunication Manager 2.1 Avaya Labs

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    SM Avaya IP Telephony Implementation Guide 2

    All information in this document is subject to change without notice. Although the information isbelieved to be accurate, it is provided without guarantee of complete accuracy and without warranty of

    any kind. It is the users responsibility to verify and test all information in this document. Avaya shallnot be liable for any adverse outcomes resulting from the application of this document; the user accepts

    full responsibility.

    The instructions and tests in this document regarding Cisco products and features are best-effort attemptsat summarizing and testing the information and advertised features that are openly available atwww.cisco.com. Although all reasonable efforts have been made to provide accurate information

    regarding Cisco products and features, Avaya makes no claim of complete accuracy and shall not beliable for adverse outcomes resulting from discrepancies. It is the users responsibility to verify and testall information in this document related to Cisco products, and the user accepts full responsibility for all

    resulting outcomes.

    2004 Avaya Inc. All Rights Reserved.

    Avaya and the Avaya Logo are trademarks of Avaya Inc. or Avaya ECS Ltd., a wholly owned subsidiary

    of Avaya Inc. and may be registered in the US and other jurisdictions. All trademarks identified by and are registered trademarks or trademarks, respectively, of Avaya Inc. All other registered trademarks ortrademarks are property of their respective owners.

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    Foreword

    Several benefits are motivating companies to transmit voice communications over packet networksoriginally designed for data.

    Cost saving is one factor. By eliminating a separate circuit-switched voice network, businesses avoid theexpenses of buying, maintaining and administering two networks. They may also reduce toll charges by

    sending long distance voice traffic over the enterprise network, rather than the public switched telephonenetwork.

    Another benefit is the potential to more tightly integrate data and voice applications. Because they useopen programming standards, Avaya ECLIPS products make it easier for developers to create, and forcompanies to implement, applications that combine the power of voice and data in such areas as customerrelationship management (CRM) and unified communications. A converged multi-service network canmake such applications available to every employee.

    These benefits do not come free, however. Voice and data communications place distinctly differentdemands on the network. Voice and video are real-time communications that require immediate

    transmission. Data does not. Performance characteristics that work fine for data can produce entirelyunsatisfactory results for voice or video. So networks that transmit all three must be managed to meet the

    disparate requirements of data and voice/video.

    Network managers are implementing a range of techniques to help ensure their converged networks meetperformance standards for all three payloads: voice, video and data. These techniques include the

    strategic placement of VLANs, and the use of Class of Service (CoS) packet marking and Quality ofService (QoS) network mechanisms.

    For an overview of IP telephony issues and networking requirements, see the Avaya IP Voice QualityNetwork Requirements white paper at www1.avaya.com/enterprise/resourcelibrary/applicationnotes.

    Professional consulting services are available through The Avaya Business Communication Solutions andIntegration group. One essential function of this professional services group is to provide pre-deploymentnetwork assessments to Avaya customers. This assessment helps to prepare a customers network for IPtelephony, and also gives critical network information to Avaya support groups that will later assist with

    implementation and troubleshooting. Arrange for this essential service through an Avaya account team.

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    Avaya IP Telephony Implementation Guide

    Table of Contents

    1 Introduction to VoIP and Avaya Products.............................................................................................7

    1.1 Servers, Gateways, Stations, and Trunks Defined......................................................................7

    Servers ........................................................................................................................................7Gateways..................................................................................................................................... 7Stations........................................................................................................................................ 7Trunks .........................................................................................................................................8

    1.2 Avaya Server-Gateway and Trunk Architectures .......................................................................8

    Traditional DEFINITY! System ...............................................................................................8IP-enabled DEFINITY System...................................................................................................9

    S8700 Multi-Connect ................................................................................................................ 10

    S8500 Media Server.................................................................................................................. 10S8700 IP-Connect .....................................................................................................................11S8300/G700/G350 ....................................................................................................................11S8700 Multi-Connect with remote G700/350 gateways...........................................................12

    S8700 IP-Connect with remote G700/350 gateways ................................................................13S8100/G600 ..............................................................................................................................13Trunks .......................................................................................................................................14

    1.3 VoIP Protocols and Ports..........................................................................................................15

    2 IP Network Guidelines ........................................................................................................................ 16

    2.1 General Guidelines.................................................................................................................... 16

    Ethernet Switches...................................................................................................................... 16

    Speed/Duplex ............................................................................................................................ 17

    2.2 Bandwidth Considerations........................................................................................................18

    Calculation ................................................................................................................................ 18Ethernet Overhead ....................................................................................................................19WAN Overhead ........................................................................................................................19L3 Fragmentation (MTU) .........................................................................................................19L2 Fragmentation...................................................................................................................... 20

    2.3 CoS and QoS............................................................................................................................. 20

    General ...................................................................................................................................... 20CoS............................................................................................................................................ 20

    802.1p/Q ................................................................................