VoIP specialist Vonage has this week upped its UK presence by finally launching an adapter that enables users to make inexpensive Voice over Internet Protocol (VoIP) calls through their existing landline phones rather than the standard way of using a PC and a headset. The adapter comes with the complete Vonage package, which varies in price depending on where you get it from. The cheapest way though is through its website. The adapter plugs into a standard phone and the Ethernet connection of a broadband router. A wireless version of the system, which has already gone on sale in the US, will be available later in the year. Vonage offers unlimited UK and Ireland calls for a subscription of £9.95 month. Users pay additional costs for calls to mobiles and international numbers.