First, you will need to create 2 different CUCM Groups, on the first one you will have on the "Selected CUCM List" the Pub on the top and on the second you will have the Sub on the Top. This way the phones on the first Group will look first to register on the pub and then on the Sub and opposite.
Then, you will need to create 2 Device Pools where on each one -amongst others- you will need to denote the above CUCM Groups (device pool-1 CUCMGroupPub, device pool-2 CUCMGroupSub).
Finally, you will need to assign each phone on the Device Pool, based on the Group of CUCM that belongs to.
I hope the above helps,
G
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