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Deltathree inc.
Industry Communications services
Founded 1996; 21 years ago (1996)
Headquarters New York City, United States
Key people
Dror Gonen (President and CEO), Lior Samuelson (Chairman of the board)
Products Voice over IP
Revenue US$29.47 million (2007)[1]
Decrease (US$9.31 million) (2007)[1]
Number of employees

Deltathree Inc. is an American company engaged in the business of voice over IP telephony services. The company was one of the first in the world to offer a telephony service over the internet.[2]

Users can either use the free softdialer product and make calls through their PC, or sign up for the broadband phone service and receive an Analog Telephony Adapter (ATA)or the linksys PAP2 device. Both devices allows users to plug a standard phone into their internet connection and make calls independent of the PC.


Deltathree was founded in 1996 by Dmitry Goroshevsky, Sophia Babkove and Damian Kudriavtsev,[3] which later brought Elie Wurtman and Jacob Davidson as investors and developed 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.[5][6] In 2001 RSL Communications sold its stake in the company to billionaire entrepreneur Yitzhak Tshuva who later sold his shares at a profit.[7]

In 2001, the original company founders left to start a new company, CrossOptix, that developed ultra-high speed optical interconnect solutions;[8] Noam Bardin was appointed as CEO, Bardin left in 2007 and later become CEO of popular GPS application Waze.[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.[10]

As of December 2009, Deltathree announced that it has sold a majority stake (54.3%) to Australian company D4 Holdings for $1.17 million in cash. Under the agreement D4 also has the right to pick up an additional 30 million shares at 4 cents a share for the next ten years.[11]

In July 2010, deltathree Launched joip Mobile Phone Application for Consumers on Leading Cellular Operating Systems. joip voip Mobile dialer services Offers Savings on Mobile Phone Bills for Smartphone customers. Joip voip Mobile ( is a new cellular phone application providing low cost mobile calls over GSM as well as WiFi networks. It currently offers calling packages to the United States, Canada, United Kingdom and over 150 countries worldwide. Cellular operating systems supported by joip Mobile currently include the iPhone, Google Android and Nokia Symbian, with support for the Windows Mobile operating system and Blackberry expected soon.


Deltathree's research and development facility, and operational center at the Jerusalem Technology Park

Deltathree's research and development facility, and operational center is based at the Jerusalem Technology Park.[12]

Deltathree offers its VOIP services to the residential, commercial and small business market, as well as offering a hosted white label turnkey VOIP solution to enterprises. Deltathree segments its customer base into three areas: Direct to End User, Resellers, and Hosted VOIP.

Direct to End User includes the iConnectHere Voice Over IP products, which can be used by either residential customers or small businesses. iConnectHere provided VOIP calls either through the software available via download this works in a similar fashion to Skype. Users can also use their own standard phone if plugged into an ATA or a Linksys. Mobile.Joip is a new platform for end-users looking make low cost VoIP calls over WiFi or cellular data plan, without using your wireless minutes.

Resellers typically includes internet cafés and call centers that offer low cost routing to their own customers.

Hosted VOIP: For large enterprises with the necessary infrastructure and investment can integrate the Deltathree VOIP network giving them total control over billing, customer service and pricing. Yor Voice is an example VoIP company that is listed under this category.


The VOIP marketplace has grown significantly over the last decade with a small number of companies driving the industry with strong marketing such as Vonage and well-publicized buyouts such as Skype purchased by Microsoft.


  1. ^ a b "Annual Report 2007" (PDF). Deltathree. Retrieved 2008-07-18. 
  2. ^ Dmitry Goroshevsky Interview: Popular Telephony P2P Revolutionizes VoIP, TMC Labs November 2004
  3. ^ Founders of Internet Telecom and Delta Three Launch a New Optical Communications Start-Up
  4. ^ Delta Three Inc. Enables PC-To-Phone Calls Worldwide; Delta Three(TM) Joins VocalTec's NextGen Telephony Program, Providing Service to Over 200 Countries Worldwide, PR Newswire Aug 18, 1997
  5. ^ a b Scheier, Rachel (29 November 1999). "Dot-com Friendship Worth Millions". New York Daily News. Archived from the original on 2011-06-05. Retrieved 2008-07-18. 
  6. ^ "Internet Phone Provider Plans Stock Sale". The New York Times. September 7, 1999. Retrieved 2008-07-18. 
  7. ^ Sewell, Chris (Jul 2, 2001), "RSL sells deltathree stake", Connected Planet, archived from the original on 2010-12-15 
  8. ^ Israeli-American optics startup CrossOptix secures $4 million seed financing, The Street Nov 27, 2001
  9. ^ Deal Primes Israel’s Silicon Wadi for Wave of Investment, Douglas MacMillan Bloomberg Technology, June 12, 2013
  10. ^ "deltathree Kicked Off Nasdaq". PHONE+ magazine. 25 March 2008. Retrieved 2008-07-18. 
  11. ^ Doug Mohney (February 4, 2009), "Deltathree changing hands", FierceVoIP, archived from the original on 2009-02-19 
  12. ^ Delta Three Israel Ltd - Company Profile Bloomberg

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