PTGi Holding, Inc., formerly Primus Telecommunications Group, Incorporated, is an integrated facilities-based communications services provider offering a portfolio of international and domestic voice, wireless, Internet, voice over Internet protocol (VoIP), data, colocation and data center services to customers located primarily in Australia, Canada, and the United States. It classifies its services into three categories: Growth Services, Traditional Services and International Carrier Services. The Company operates in three segments: Canada, Australian, International Carrier Services and the United States. On February 28, 2011, the Company acquired Arbinet Corporation. In November 2011, its Australian operations acquired Access International Group Pty Ltd.