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This paper describes the integration of the presence management service into existing IP Multimedia Subsystem (IMS) laboratory infrastructures. Both laboratories - NGNlab in Bratislava and the laboratory in Leipzig - use the Fraunhofer OpenIMS as core components for their testing IMS environment (i.e. Call Session Control Functions (CSCF), Home Subscriber Server (HSS)). The virtualization of these...
Over recent years, the explosion of radio access technologies and wireless networking devices has triggered the intensive use of nomadic computing. Mobile devices receive intermittent network access, and alternate between connected and disconnected states. However, today's personal gadgets have more networking capabilities, wireless network coverage is becoming ubiquitous, and always-on IP-based services...
This article focuses on the interconnection border control function (IBCF) entity in the current IP multimedia subsystem (IMS) architecture. Based on the analysis of various types of IMS interconnection scenarios, we describe our proof-of concept solution. We evaluate the signaling in several interconnected IMS domains using open sip express router (OpenSER) based prototype of IBCF.
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