At the risk of asking the obvious, is there anything unusual about the 2 cell numbers you can call but cannot CFWD to? Example, are they possibly long distance numbers?
Look at your call routing to determine if calls to all three cell numbers use the same Route List. If they do not, then there is a clue. Check the CSS of your inbound trunks to see if they have the necessary outbound partitions to allow the call to make the trunk-to-trunk interconnect.
Original MUG/NAMU Charter Member