How to do the Queue Prioritization.

Hi ,

We are working on PI 7.0 and frequently facing the messages processing delay from queues. So we need to give high priority for critical interfaces and need to process first ,if they come to queue later also than low priority interface messages.How can we find the high priority messages and corresponding queue names as well as how to do this task in production system.

Can some one explain clearly on this task.

Thanks,

NAGA