I have a 50Mbs Satellite link and a 10Mbs Microwave link supplying a very remote location.

Behind these links, I have a 6,400 seat network - with about 3,000 signed in at any one time.

My goal is to send all of the Voip traffic (Google Chat, Magic Jack, Skype, Speakeasy, Vonage, Vonage PC, Yahoo) through the microwave link which has 100ms latency. The rest of the traffic can utilize any remaining bandwidth of the microwave link with excess being diverted to the higher latency (600ms) satellite connection.

The problem I've had so far is that most automatic routing configurations weigh the bandwidth heavily for preference - and I'm only wanting latency considered.

Additionally, I don't know if this can even be handled with the routing hardware I have at my disposal (Cisco 3640, 3745, & 3845).

Any recommendations (or really good starting points) would be greatly appreciated.