Lifesize was a video and audio telecommunications company in the United States which provided high definition videoconferencing endpoints and accessories, touchscreen conference room phones, a cloud-based video collaboration platform, and omnichannel contact center solutions under their CxEngage[2] product line.

[4] The company name change to Lifesize Communications was unveiled at the Interop trade show in Las Vegas, Nevada in May 2005.

[9] In August 2020, Lifesize announced the acquisition of Kaptivo, a digital collaboration company based in Cambridge, UK.

[16] Lifesize product portfolio includes high definition endpoints and accessories,[17] NAT/firewall traversal, touchscreen conference room phones, ISDN gateways, Multipoint Control Units and management systems, as well as mobile video conferencing software and a cloud-based IaaS offering for video conferencing.

In 2016, Lifesize brought huddle room systems to the market with Smartframing camera technology embedded.

In order to deliver high definition, live video conferencing at the time LifeSize utilized parts from Texas Instruments, Phillips Semiconductor, and Broadcom.