I propose tox. A skype alternative that's free (all terms). There are many different clients to it (kinda like IRC), and I'm aware of one (ratox for the curious) that would make the recording as easy as "cat call_out > record.wav".

One can create a group in tox, and invite people in it (like skype). If not, I have a mumble server that's up 24/7 (topped to 10 users though)