<P> The Unified Communications Interoperability Forum (UCIF), a non-profit alliance between communications vendors, launched in May 2010 . The organization's vision is to maximize the interoperability of UC based on existing standards . Founding members of UCIF include HP, Microsoft, Polycom, Logitech / LifeSize Communications and Juniper Networks . </P> <P> Videoconferencing in the late 20th century was limited to the H. 323 protocol (notably Cisco's SCCP implementation was an exception), but newer videophones often use SIP, which is often easier to set up in home networking environments . It is a text - based protocol, incorporating many elements of the Hypertext Transfer Protocol (HTTP) and the Simple Mail Transfer Protocol (SMTP). H. 323 is still used, but more commonly for business videoconferencing, while SIP is more commonly used in personal consumer videophones . A number of call - setup methods based on instant messaging protocols such as Skype also now provide video . </P> <P> Another protocol used by videophones is H. 324, which mixes call setup and video compression . Videophones that work on regular phone lines typically use H. 324, but the bandwidth is limited by the modem to around 33 kbit / s, limiting the video quality and frame rate . A slightly modified version of H. 324 called 3G - 324M defined by 3GPP is also used by some cellphones that allow video calls, typically for use only in UMTS networks . </P> <P> There is also H. 320 standard, which specified technical requirements for narrow - band visual telephone systems and terminal equipment, typically for videoconferencing and videophone services . It applied mostly to dedicated circuit - based switched network (point - to - point) connections of moderate or high bandwidth, such as through the medium - bandwidth ISDN digital phone protocol or a fractionated high bandwidth T1 lines . Modern products based on H. 320 standard usually support also H. 323 standard . </P>

According to the information in this​ video the telephone system is an example of a