Few months ago obi/hp fully downed their obi forum. The forum was around for at least a decade and a half if not longer. In more recent times, the site's been slow, very slow. Not unusual given their devices are effectively EOL.
The forum however contains lots of good technical information, how to's and more. While the obi devices are primarily ATA's, the software allows some level of PBX functionality. Forum contained information in implementing all sorts of tasks. All gone now. Leaving the forum in read only mode would be the right thing to do.
That said, the shutdown was not unexpected, so someone with the technical how to could scrap and archive the posts. Don't think that happened.