I had a similar issue once. So long ago I can't remember for sure. But it had to do with the OLI#. Not saying that will fix your issue, but try putting the DID number of that phone in that prompt. Or if a number is in the OLI then take it out or change it. I just wish I could remember for sure what we did.

The thought there is that when you forward the call, the callers ID goes out and that is not a legal number FROM that PRI. Put in the OLI of the DN and that IS a good number on that PRI.

If CON is the opposite of PRO
Then what is the opposite of Progress?