VCC aims to provide carrier-supported, standards-based seamless roaming between cellular and Wi-Fi networks. This would let customers retain single-number and voicemail access beyond the range of conventional cellular networks, as long as there's an accessible Wi-Fi
network. An alternative access method may increase customer satisfaction and could lead to greater use of phones in more places..
Although the VCC standard is led by the 3GPP standards body, MobileIgnite, a separate group led by vendor BridgePort Networks, is also a key driver. These groups are made up of wireless
carriers and equipment vendors, as well as third-party vendors that tie all the pieces together. Enterprise PBX
vendors don't play a part, as the standard is centered on carrier integration.
VCC, at least in its first iteration, falls short in addressing key enterprise features, such as data-session maintenance and supplementary service support (call waiting, call transfer and so on). It has a simplistic roaming algorithm and provides no integration with the enterprise PBX. On the other hand, it will drive the development and availability of carrier-grade SIP-based dual-mode handsets.