Similar devices from Sony Ericsson, BlackBerry, Samsung, HTC, Motorola and even the Apple iPhone provide comparable dual mode technology.
As the handset becomes attached and detached from wireless access points such as WiFi hotspots, a client application in the device provides notifications of the radio conditions to a VCC platform in the network.
This allows circuit switched and IP call legs to be originated and terminated such that the speech path is transferred between domains, transparently to the end user.
Similarly, service providers are interested in VCC in order to offer FMC products towards specific market segments, such as enterprise users.
However, over several years a range of other business logic, such as GSM Supplementary Services within the Home Location Register (HLR) has been embedded within cellular networks.