[Users] Dispatcher failure route

Hello all, I'm setting up a load balancer using openser. The load balancing works great and I'm now trying to work out the redundancy side of it. In my route I have: if (method=="INVITE") { record_route(); ds_select_dst("1", "0"); t_on_failure("1"); t_relay(); } This works fine in that if the selected server is not up or takes too long to answer, the call is route to failure_route[1] And here's where I'm scratching my head. I would like the INVITE to be tried on another server from the server farm. But how. Is there a way to send it back to ds_select_dst and make sure it doesn't get sent back to the same server? thanks