Defunct VoIP companies

Nortel Networks Corporation, formerly Northern Telecom Limited, was a Canadian multinational telecommunications and data networking equipment manufacturer headquartered in Ottawa, Ontario. It was founded in Montreal, Quebec, in 1895 as the Northern Electric and Manufacturing Company, or simply Northern Electric. Until an antitrust settlement in 1949, Northern Electric was owned mostly by Bell Canada and the Western Electric Company of the Bell System, producing large volumes of telecommunications equipment based on licensed Western Electric designs.

Gizmo5 (formerly known as Gizmo Project and SIPphone) was a voice over IP communications network and a proprietary freeware soft phone for that network. On November 12, 2009, Google announced that it had acquired Gizmo5. On March 4, 2011, Google announced that the service would be discontinued as of April 3, 2011.

Jajah was a VoIP (Voice over IP) provider, founded by Austrians Roman Scharf and Daniel Mattes in 2005. The Jajah headquarters was located in Mountain View, CA, United States, and Luxembourg. Jajah maintained a development centre in Israel. On 23 December 2009, it was announced that Jajah had been bought by Telefónica through its subsidiary Telefónica Europe. In December 2013, Telefónica announced that Jajah would shut down at the end of January 2014.