A little background...
We recently changed telephone providers here in Chicago, from Birch Communications to GTT Communications.
We are running FXII, using VMMI 197/17E

Before this change, CFOS had been working without issues. Of course no one really uses it much, until recently an employee tried enabling their phone and it would not work.

Following steps we always used,
Get to CFOS
Choose LNE/INTCM
Set Line 09, but we have used others
Set number, Save

What happens now, is that we call that extension from another phone and LCD displays CFOS is active, I hear several beeps, as if it tries to grab a number but then nothing, until I hear the same beeps, and it just cycles form there.

Notes: We use to have 1:1 DID set up for all our phones, but in a cost saving measure we only moved on to GTT with a fraction of the DID we had before. The phones I have tested on have no DID, so I tried on mine as well which does have a DID assigned to see if had anything to do with that. On the surface no, since it doe snot work with my phone either.