This list of video telecommunication services and product brands is for groupings of notable video telecommunication services, brands of videophones, webcams and video conferencing hardware and systems, all related to videotelephony for two-way communications with live video and audio. The first section includes video telecommunication devices such as videophones, videoconferencing and telepresence systems, webcams and related products such as codecs and videoconferencing software clients; the second section is a listing of video telecommunication services such as Video Relay Services (for deaf, hard-of-hearing and speech-impaired individuals), telemedicine, Public Access Videoconferencing facilities, etc. the last section at the bottom of this page lists defunct brands and services for historical research purposes. The products below are listed by their normal and intended purpose, even though their names or descriptions may differ from the categories shown here (refer to terminology within general article pages). Hardware, software and related product brands Videophone hardware brands for person-to-person (point-to-point) use Stand-alone videophones are point-to-point units not employing Multipoint Control Units (centralized distribution and call management systems). Earlier models make video calls utilizing older analogue POTS telephone lines, while later models use newer, higher quality, ADSL, ISDN or cable broadband technologies. Some videophones also employ Internet calling (IP) capabilities which can dispense with the need for telephone service. ACN: IRIS (United States) Avaya: Scopia videoconferencing systems AVer Information: HVC130 (Taiwan) D-Link: DVC series (Taiwan) Ericsson-LG: LVP series PSTN, ISDN and IP videophones (South Korea) Huawei: TEx0 series, VP9000 series Leadtek: IP broadband videophone (Taiwan) LifeSize: LifeSize Passport Connect, LifeSize Passport & LifeSize Express (United States) Polycom: VVX1500, VVX600 and VVX500 Business media phones (United States) Videoconferencing and telepresence hardware systems meant for multiple participants Video conferencing systems allow multiple participants by use of a Multipoint Control Unit (a centralized distribution and call management system) or via a similar non-centralized multipoint capability technology embedded in each unit. Some multiple party systems utilize Web-based bridging service providers, which can incur slight time delays. Avaya: (Radvision) Scopia systems (United States) AVer Information: EVC, SVC (Taiwan) Cisco Systems: Cisco TelePresence inc. Cisco SX, MX and Spark Room systems (United States) Highfive: Highfive & Dolby Voice (United States) Huawei: TP Telepresence series Ericsson-LG: LVP series PSTN, ISDN and IP videophones (South Korea) Facebook Portal Librestream: Onsight (Canada) LifeSize: LifeSize Icon, Lifesize Team, Lifesize Express, LifeSize Room & LifeSize Conference (United States) Panasonic: VC500 (Japan) Polycom: RealPresence Immersive Studio, OTX, HDX, RealPresence Group series