Usually these are set up to ring phones/trunks in a ring group, then overflow to an auto Attn. However, you can place 1 phone (OPR) in the ring group then overflow to another ring group with the other phone in it.
22-02 = normal
22-05 = tks in rg gp 1
22-04 = ring group 1 = OPR ext
22-08 = overflow to ring gp 2
22-04 = ring group 2 = other extension
NOTE: mode 1 is usually the day mode.