It's not responding to requests at the time of this post.
Switch to voip.freephoneline.ca or voip4.freephoneline.ca:6060.
For OBi2xx and OBi3xx series ATA users, just use this PDF guide found at the bottom of the first post to configure your ATA (take the time to do it once properly, and you'll have less headaches): viewtopic.php?f=15&t=18805#p73839. Your ATA will automatically switch registration to a working server instead of you needing to manually switch Freephoneline's proxy servers when the ATA fails a registration attempt (because a specific server happens to be down or isn't responding).
Fongo has been notified of the issue.