PCTEL released a VoIP-Enabled Roaming Client that enables users to initiate and receive calls using a single number on cellular and IP networks. 
The initial release operates over GSM and Wi-Fi networks. Later releases will incorporate CDMA standards. The VoIP client was developed in cooperation with a leading MobileVoIP infrastructure vendor.
Key features of the Roaming Client VE include connection management, profile management, Wi-Fi HotSpot authentication and 802.1x / WPA security. The Roaming Client-VE utilizes SIM-EAP for authentication. Using a single user interface, a user can share contacts, call histories, and other common phone features.
PCTEL said that the latest 3G/WiFi Smart Phones will be able to initiate a VoIP call from a Wi-Fi HotSpot and then maintain that call while roaming onto a cellular network, when supported by the appropriate infrastructure. The initial release will roam in standby mode.
PCTEL currently supplies its Roaming Client products to T-Mobile (U.S.), Cingular, SBC, NTT DoCoMo, NTT Communications, GoRemote and others.
