Adding 2nd LIM in Routes

[blueprint321]

Hi Lads,

First time poster longtime viewer

Any help much appreciated.

Bit of background details

I currently have 3 MX-ONE's as one logical system at our mainsite and three MD-110's at 3 other campuses all connected via a WAN.

The internal routes beteeen sites failover as follows;
0. IP Trunk (remote sites point to LIM 1 at mainsite)
1. Microwave
2. Onramps

With the possibility of LIM 1 failing I'd like to add LIM 3 as the second option in the routes (option 1) - the idea is that if LIM 1 fails users on LIM 2 and 3 should still be able to receive calls from the other internal sites over the IP trunks.

Problem

I've tested adding in LIM 3 as the first choice just to see if calls connect and they do not. Is it possible to have a LIM other than the first 1 to handle internal route traffic?

If so can, can someone point me in the directions of the commands I should be using

Cheers

Blue