Interoperability among Different IMS Cores

The IMS as core for operators’ network is imminent. However, the interconnection is still an issue on basic call layer, but also on services layer. In this article, we present the NetLab project approach, which has the aim to create a testing environment for research and development of new services and applications based on the IP Multimedia Subsystem (IMS). The results of interconnection tests between several IMS platforms are also provided here.