[1] More than 1,000 mobile and fixed line telecommunications carriers and service providers outsourced some or all of their international voice traffic to iBASIS.

[2] iBASIS customers include many carriers, mobile operators, and emerging service providers including Verizon, Vodafone, VSNL, China Mobile, China Unicom, IDT Corporation, Qwest, Skype, Telecom Italia, and Telefonica.

iBASIS was founded in 1996 by Ofer Gneezy and Gordon VanderBrug to provide wholesale international long-distance services to carriers using Voice over Internet Protocol (VoIP) technology.

[7] On February 8, 2019, KPN completed the sale of its iBASIS wholesale division to Tofane Global, led by Alexandre Pébereau.

With Tofane's prior acquisition of Altice Europe N.V in September 2018, the combined company became the third largest wholesale voice operator, with revenues of more than $1 billion a year.