[2] Users can either use the free softdialer product and make calls through their computer, or sign up for the broadband phone service and receive an Analog Telephony Adapter (ATA) or the linksys PAP2 device.

Deltathree was founded in 1996 by Dmitry Goroshevsky, Sophia Babkove, Damian Kudriavtsev [Wikidata],[3] Elie Wurtman and Jacob Ner David to develop an Internet-based international low cost calling service using VoIP technology, and a "PC to Phone" solution, using a technology developed by Israeli company VocalTec Communications.

[4] RSL Communications, an investment firm owned by Ronald Lauder, acquired a majority stake in Deltathree the following year,[5] before the company listed on the NASDAQ stock exchange in November 1999.

During that time, Wurtman completed the first historic transcontinental phone-to-phone VoIP call with FCC Chairman Reed Hundt.

[9] The company's shares were delisted by NASDAQ in March 2008 after falling below $1, forcing Deltathree stock to trade through the OTC Bulletin Board.