Yealink VC Series Administrator's Manual

Also see for VC Series: Quick start guide

Contents

System Overview1This chapter contains the following information about VC400/VC120 video conferencingsystem: VoIP Principles Packaging Contents System Component Instructions Icon Instructions LED Instructions User InterfacesVoIPVoIP (Voice over Internet Protocol) is a technology that uses the Internet Protocol insteadof traditional Public Switch Telephone Network (PSTN) technology for voicecommunications.It is a family of technologies, methodologies, communication protocols, andtransmission techniques for the delivery of voice communications and multimediasessions over IP networks. The H.323 and Session Initiation Protocol (SIP) are twopopular VoIP protocols that are found in widespread implementation.H.323H.323 is a recommendation from the ITU Telecommunication Standardization Sector(ITU-T) that defines the protocols to provide audio-visual communication sessions onany packet network. The H.323 standard addresses call signaling and control,multimedia transport and control, and bandwidth control for point-to-point andmulti-point conferences.It is widely implemented by voice and video conference equipment manufacturers, isused within various Internet real-time applications, such as GnuGK and NetMeeting,and is widely deployed by service providers and enterprises for both voice and videoservices over IP networks.SIPSIP (Session Initiation Protocol) is the Internet Engineering Task Force‘s (IETF‘s) standardfor multimedia conferencing over IP. It is an ASCII-based, application-layer controlprotocol (defined in RFC 3261) that can be used to establish, maintain, and terminate