Lync Edge Servers Default Gateway - HELP

Yeah we used that guide to setup our config. No SNAT enabled on AV VIPs. EVerything set per the template (v11). We initially had a call in to MS because of our disconnect issue when we had the lync edge default GW set to the internet router. The call got escalated and before we got a call back, we tried pointing the default gateway to the self IP of BigIP and boom no more disconnects, everything was working great. We actually told them the issue was resolved. But you are telling me that old config should have worked right (default GW pointing to internet router)? Everything worked fine under that config except meeting audio, it would disconnect after about 5 seconds every time, and it was connecting directly to AV service on one of the edge servers. I mean right now if I point the default gateway back to internet router, then try the lync attendee, its same issue I had with full lync client before, meeting audio connects for about 5 seconds and then disconnects.