What is the reason for only part of the 3G data traffic to be going through the 3G Direct Tunnel and another part is going through the SGSN. There are counters for traffic in IuPS interface which still show there is data traffic in the SGSN. The greater part of the traffic is going through the Direct Tunnel, but not all. The Iu user plane traffic should go through the Direct tunnel and the Iu control plane traffic should go to the SGSN. And counters still show user pane traffic going through the SGSN. There must be a reason for this.