How to make auto swapping Pri in asterisk

I have 3 pri lines …i wanted to auto swapping the calls to other PRI .

for ex : g0,g1,g2 are the lines

if g0 down the call sholuld go thougg g2 line.

and if g2 and g3 is down the calls should gothroug the g1 line with pout swapping mauvally

Have you considered putting all of the physical lines inside of the same group?

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i dont want to put as same group…i want auto swapping the pri line one if the other pri is are down