Internet telephony firm Skype today promised free wireless voice calls for millions of European surfers via a version of its software for the recently launched Siemens Gigaset DECT cordless phones.

The company said that its free internet telephony software works with Siemens handsets via the Gigaset M34 USB adapter, an open interface adapter plugged into the USB connection point of a users' PC.

The handset has been designed to provide cordless access to Skype features including free Skype-to-Skype calling, buddy lists, the Skype Global Directory and conference calling.

"We launched the Siemens Gigaset internet telephony solution so that consumers can benefit from cheaper or even free calling and messaging," said Paul Reitmeier, president of customer premises equipment devices at Siemens.

The adapter works with the recently launched Gigaset C340/345, CX340/345isdn, S440/445, SX440/445isdn, S645 and SL440.

It will also enable Gigaset phones to use the SkypeOut service which allows users to make pre-pay calls to traditional phone numbers at local rates.

Niklas Zennström, Skype chief executive and co-founder, said: "Skype is expanding the range of complementary platforms to provide consumers with choice and flexibility alongside the quality gains and cost-savings of modern calling."