Nexus Telecom provides off-the-shelf products and services to monitor, test and measure how a subscriber experiences the service provided by an operator. Nexus Telecom has its roots in Service & Network Performance Management and Roaming Monitoring, and is one of the major players in the Service Assurance Domain belonging to the OSS industry. Nexus Telecom's analytical software, as well as our real-time investigation systems and techniques, allow telecommunication service degradations and network malfunctions to be quickly detected and appropriate resolutions to be determined.