capabilities. A videoconference (also known as a videoteleconference) allows two or more locations to communicate via live, simultaneous two-way video and audio transmissions. This is often accomplished by the use of a multipoint control unit (a centralized distribution and call management system) or by a similar non-centralized multipoint capability embedded in each videoconferencing unit. Again, technology improvements have circumvented traditional definitions by allowing multiple party videoconferencing via web-based applications. A separate webpage article is devoted to videoconferencing. A telepresence system is a high-end videoconferencing system and service usually employed by enterprise-level corporate offices. Telepresence conference rooms use state-of-the art room designs, video cameras, displays, sound-systems and processors, coupled with high-to-very-high capacity bandwidth transmissions. Typical use of the various technologies described above include calling or conferencing on a one-on-one, one-to-many or many-to-many basis for personal, business, educational, deaf Video Relay Service and tele-medical, diagnostic and rehabilitative use or services. New services utilizing videocalling and videoconferencing, such as teachers and psychologists conducting online sessions, personal videocalls to inmates incarcerated in penitentiaries, and videoconferencing to resolve airline engineering issues at maintenance facilities, are being created or evolving on an ongoing basis. See also eMedicine List of Session Initiation Protocol (SIP) software Mobile collaboration Telepresence Unified communications, the integration of non real-time communication services such as unified messaging (integrated voicemail, e-mail, SMS and fax) with real-time communication services such as instant messaging, etc. Videotelephony, parent article Web conferencing, used to conduct live meetings or presentations via the Internet Webcam (Internet web cameras) Webcast, “broadcasting” over the Internet References Further reading Bajaj, Vikas. Transparent Government, Via Webcams in India, The New York Times, July 18, 2011, pg.B3. Published online: July 17, 2011. Davis, Andrew W.; Weinstein, Ira M. The Business Case for Videoconferencing, Wainhouse Research, March 2005. Hoffman, Jan. When Your Therapist Is Only a Click Away, The New York Times, September 25, 2011, pg. ST1. Also published September 23, 2011 online at www.nytimes.com. Saint Louis, Catherine. With Enough Bandwidth, Many Join The Band, The New York Times, January 10, 2012 (online), January 11, 2012 (in print, New York Edition, pg. A1). Retrieved online January 11, 2012. Synopsis: a look at the pros and cons of videotelephony used for private, individual, music lessons. External links Telecommunications lists Services And Product Brands Lists of brands