High Quality Content by WIKIPEDIA articles! Global Crossing Limited was a telecommunications company that provides computer networking services worldwide. It maintained a large backbone and offered transit and peering links, VPN, leased lines, audio and video conferencing, long distance telephone, managed services, dialup, colocation and VoIP, to customers ranging from individuals to large enterprises and to other carriers. The main emphases was on higher margin layered services like managed services and VoIP with leased lines. Global Crossing is a tier 1 carrier. On October 3, 2011, the company was purchased by Level 3 Communications.