There are 6 switches in LAN. All of them are cisco 3560. There are three vlans. Vlan 35 is for data vlan. Vlan 36 is for phone vlan. Vlan 38 is for CCM vlan. Recently, we found there are many packages lost between IP Phone in LAN. I monitored all interfaces in LAN. The bandwidth for all interfaces are normal. But the IP Phone, 7941, still lost many packages. I don't know how to resolve the problem. Can any one help me? Thanks!