us.voxalot.com is down (stopped registering on 12/27). eu.voxalot.com and au.voxalot.com are still working.
I also went to sipsorcery, but I am running a local version on my VPS. I guess I got tired of voip providers dying on me. SIPSorcery used to be free, now it costs $35/year. I can get a good VPS for about $50 a year and run Sipsorcery, website, php, proxy etc. The best part is I have full control and nobody can shut down my SIPSorcery local instance because they are not making money