make calls and send text messages when out of cellular coverage (VoWiFi). In July 2014, T-Mobile launched its VoLTE service with an IP Multimedia Subsystem (IMS) voice solution developed by Mavenir Systems. T-Mobile was the first major provider to launch VoLTE according to Converge Network Digest. In November 2014, Mavenir Systems acquired Stoke, a mobile and security gateway company. On January 13, 2015, Mavenir Systems acquired Ulticom Inc, a signaling solutions software provider, for $20 million. End In March 2015, Mitel announced to buy Mavenir Systems for $560 million; the acquisition became effective the following month. Thus the first incarnation of Mavenir came to an end. Two years later, as the result of the merger of established company Xura with the Mavenir Systems part of Mitel and the startup Ranzure, a new company named Mavenir was formed. References External links Archive of official site Companies based in Richardson, Texas Telecommunications companies established in 2005 American companies disestablished in 2015 2005 establishments in Texas 2015 disestablishments in Texas Telecommunications equipment vendors Defunct telecommunications companies of the United States 2015 mergers and acquisitions American companies established in 2005