GTT Communications, Inc. announced the launch of its new SIP Trunking service, available immediately on a worldwide basis. GTT's SIP Trunking is an enterprise-built offering that integrates diverse communications such as voice, video and chat onto a single IP connection, allowing organizations to drive cost savings and efficiency across their businesses. The service is interoperable with key Unified Communications (UC) platforms including Cisco, Avaya, Siemens and Microsoft, and can be integrated with legacy equipment to maximize return on investment for existing infrastructure.