ECI Telecom Ltd is an Israel-based manufacturer of telecommunications equipment that provides packet optical transport products, software-defined networking applications, cybersecurity and professional services.

The Electronics Corporation of Israel became ECI Telecom in 1981, and had its first trading on NASDAQ in 1982.

[1] In November 2019, Ribbon Communications agreed to acquire ECI Telecom, through a merger, for $486 million.

Facebook in its phase five has given transport core network deployment to Ciena and worldwide metro packet network deployment to ECI telecom which will be completed by 2022.

[citation needed] ECI has over 3,000 employees with offices in over 20 countries and development centers in India, China, and Israel.