Ubiquitous communications require wireless networking and infrastructure network support. The first step is to look at how the different available technologies will integrate and work with each other. One of the next steps is to seek solutions for connecting “ubiquitous devices” to such “integrated and heterogeneous networks”. These two steps together form the evolutionary approach towards ubiquitous communications. This paper introduces our currently implemented ubiquitous transmission system for “ubiquitous devices/terminals/handset”, called AnyServer with Intelligent Multi-mode Nodes (IMN) for 3G/GSM/WiFi/Internet. AnyServer is an intelligent platform to provide the IMNs with smooth QoS connections/ communications, synchronization and roaming over the heterogeneous networks which is open, scalable, and complaint with IEEE/IETF standards. AnyServr enables IMNs to setup/maintain the real-time video/audio connections among the networks, facing the mobility in the heterogene...