Lync Edge Servers Default Gateway - HELP

I think either pointing the Edge servers at the router address OR pointing at the BIG-IP self-IP address (if the BIG-IP has a default route pointing to the router) should work. In either case, the Edge servers will be able to talk directly to the clients without being proxied by BIG-IP. In your successful test with the Lync client, they were not, which tells me something is not ideal. It allowed the Lync client to work inefficiently, but attendee didn't like it. If you want to post a diagram of your topology, or PM me with it, I can have a look.