http://www.macnn.com/articles/04/07/09/sipphone.supports.os.x/
SIPphone Internet phone service supports Mac OS X
updated 05:20 pm EDT, Fri July 9, 2004
SIPphone supports OS X
, a free Internet phone service, has added support for Mac OS X. Previously, Mac users could buy a hardware adapter to make and receive SIP calls from their home or work phone; however, SIPphone has now released a free softphone for computers and laptops, including Mac OS X: the Xten 2.0 softphone. "With SIPphone, users get a phone number, free voicemail to email, free conference calling, free SIP-to-SIP calling anywhere in the world, very cheap International dialing, and the option of a virtual number in the US or the UK so they can receive calls from the 'traditional' phone network."
