GNU Free Call Announced, SIP-based VoIP
andrea.sartori sent in the "development plan for GNU Free Call, an open source VoIP service based on the SIP protocol. According to the announcement, it 'aims to be as ubiquitous and usable as the proprietary Skype VOIP service.'"
No, the odds are that if somebody is using Linux they're using it as part of an operating system cobbled together from various parts from various sources released under several different Free and/or Open Source licences, thus Linux.
At some point, somewhere, the entire internet will be found to be illegal.