I would check the trunk CLS, is it UNR, CTD etc & the NCOS. Also check the TARG/TGAR for the extn & trunk route, especially if the call is coming in on 1 route, then exiting on another.
Also, check NET data that EXTT is yes.
I just enabled one of our switches to be able to call forward externally by Load 15 chg rdr enter to option prompt and put in cff. it was cfo. by making it cff we can now forward. I don't know if this pertains to your problem but it was an easy fix.
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