We're using Cisco IP Phones 7971G-GE connected to a Cisco switch 3560G PoE-24 on a Cat6 network. The version of the Call Manager is 5.1.1. The switch, phones, servers and clients are setup to use a port configuration of 1000Full (we tried in auto neg also with the same result). The clients workstations are connected to the Pc port of the phone (also setup to 1000Full). When we try to upload a file to the server we have a normal bandwidth (around 30Mo/s) but when we try to download a file from the server (or from other clients) the bandwidth drop to 300ko/s... if we connect the client workstation directly to the network plug (bypassing the phone) we have a regular download (around 22Mo/s). So it seems that the phone for some reason degrade (damage) the incoming bandwidth... any idea?