Associassion problem

Hello Guys,

I am trying to communicate two XBee Znet2.5 module. i set one of them to be the coordinator and the other one to Router/End device…
i have set all the parameters correctly, but it seems that i a have a problem with associassion because the CH value in the coordinator is 17, and in router CH is 0.
I dont know why are the association is not carried out!!

plz help me guys asap!!

If you read the AI command on the router, what value does it return?