According to BBG Communications, in 2006, a SIP (Session Initiation Protocol) stack and a VoIP client in Nokia E-series dual-mode Wi-Fi handsets (Nokia E60, Nokia E61, Nokia E70) were launched in the market. The SIP stack and client have since been introduced in many more E and N-series dual-mode Wi-Fi handsets, most notably the Nokia N95 which gained popular following particularly in Europe.




