About This GuidevAbout This GuideThis guide is intended for administrators who need to properly configure, customize, manage,and troubleshoot the IP phone system rather than end-users. It provides details on thefunctionality and configuration of IP phones.Many of the features described in this guide involve network settings, which could affect the IPphone’s performance in the network. So an understanding of IP networking and a priorknowledge of IP telephony concepts are necessary.DocumentationsThis guide covers SIP VP-T49G, SIP-T48G, SIP-T46G, SIP-T42G, SIP-T41P, SIP-T40P, SIP-T29G,SIP-T27P, SIP-T23P/G, SIP-T21(P) E2, SIP-T19(P) E2 and CP860 IP phones. The following relateddocuments are available: Quick Start Guides, which describe how to assemble IP phones and configure the mostbasic features available on IP phones. User Guides, which describe the basic and advanced features available on IP phones. Auto Provisioning Guide, which describes how to provision IP phones using theconfiguration files. Description of Configuration Parameters in CFG Files, which describes all configurationparameters in configuration files. .cfg and .cfg template configuration files. IP Phones Deployment Guide for BroadSoft UC-One Environments, which describes how toconfigure BroadSoft features on the BroadWorks web portal and IP phones.For support or service, please contact your Yealink reseller or go to Yealink Technical Supportonline: http://support.yealink.com/.Conventions Used in Yealink DocumentationsYealink documentations contain a few typographic conventions.You need to know the following basic typographic conventions to distinguish types of in-textinformation:Convention DescriptionBoldHighlights the web/phone user interface items such as menus,menu selections, soft keys, or directory names when they areinvolved in a procedure or user action (e.g., Click on
