My network currently has 30 VoIP phones using 8x8. The network connection is Covad wireless 2MB up and down. Now I guess this is a dish on our roof. What the problem is clients in the office are getting dropped during calls and their phone will randomly display no service. I've checked the bandwidth and it looks like it's fine. Also the jitter looks fine. What should I look for when trying to diagnose this. Any tips?