About This GuidevAbout This GuideThank you for choosing the Yealink VC400 full HD video conferencing system. It supports 1080Pfull-HD video conferencing and includes outstanding features such as good compatibility, easydeployment and intelligent network adaptability. This makes it the perfect choice for SMEs.The Yealink VC400 full-HD video conferencing system is designed to help enterprises organizevideo conferences easily and efficiently. Users can expect to enjoy the high-quality videoconferencing experience very cost-effectively.This guide provides everything you need to start using your new video conferencing system.First, verify with your system administrator that the IP network is ready for system configuration.Also be sure to read the Overview and Getting Started sections in this guide before you set upand use the VC400 video conferencing system.In This GuideTopics provided in this guide include: Chapter 1 Overview Chapter 2 Getting Started Chapter 3 Customizing the VC400 Video Conferencing System Chapter 4 Using the VC400 Video Conferencing System Chapter 5 Using Cloud Platform Chapter 6 TroubleshootingSummary of ChangesThis section describes the changes to this guide for each release and guide version.Changes for Release 22, Guide Version 22.15The following section is new for this version: Account Polling on page 85 Using the StarLeaf Cloud Platform on page 128Major update has occurred to the following section: Changing the Video Input Source on page 115