You can define the order that you want on CAS.
Suppose you create one ds0-group per timeslot, that will create 24 voice-ports for T1.
These 24 voice-ports you will re-group together in a trunk-group, each one with a preference that will ultimately define the order in which they are used, or other schemes if you want.
Then the DP will reference the single trunkgroup above.
Hope this helps, please rate post if it does!
