GHTROUT, In my example 6599, 8255, or any other number in the system will never access the 2 COT trunks unless they are allowed outbound access via the route ACOD or through BARS.
Example 2 that we have working at a brokerage firm:
They have 4 COT Ground Start trunks for inbound calls. We setup 4 DNs, 5001-5004 on keys 8-11 on 7 or 8 different sets (2616). The ATDN of the 4 COT lines are 5001-5004 respectively and the hunting is performed by the C.O. so no need for LHK in this case. Basically looks like a key system. These sets do not access these lines for outbound, they grab key 0, dial 9, and use the normal PRIs.
Call comes into the 1st COT line and rings all sets on key 8. User answers and key 8 remains lit as busy on all sets. Next call comes in and hunts to 2nd CO Line which rings to key 9. It is answered and remains lit on key 9 of all sets in the group. Works great.
If these 4 lines were needed to be used for outbound, then it throws a kink in it but would still work although the correlation may be wrong. If the user grabbed key 8, DN 5001, and dialed out using the route ACOD, they would grab the 4th COT (using linear sequence) which is programmed to ring in on key 11. But the users will still see 5001 lit up as busy on all sets in the group. LHK would have to be 11 for this to work properly as well. You could also train the users to start their outbound calls with key 11 so the correlation matches. If the user grabbed key 0 and made the same call, then yes all DNs on keys 8-11 will be dark and no one will know the line is tied up.
And I may be way overthinking what NorstarOption wants to do but I'm just giving a setup we have working currently that sounds like what he is after.
War Eagle!!