Two ISDN Lines with one numbering plans


I have a two ISDN Lines with the same numbering plans (100 phone numbers). I would like to connect ISDN lines to separate two Aserisk servers. My question is how to announced phone numbers for this two ISDN lines from asterisk. Every asterisk server have different dial plan, so If a call is routed throw wrong line It will not be handled.

Please help me. Any information will be appreciated.
Thank You.

Hi Use the switch statement

details are in this post from me some time ago