The CG9812 is a large-capacity charging gateway developed by Huawei. Located between GSN/UGW and the BS, the CG9812 receives and stores the CDRs generated by the GSN/UGW, converts the format of the CDRs to generate final CDRs required by the BS, and then sends the final CDRs to the BS. Figure 1 shows the typical networking of the CG9812. http://localhost:7904/pages/31184372/01%20%282010-03-10%29/31184372/01%20%282010-03-10%29/resources/description/figure/fg_010200_01_CG.png | GSN: A term which is used to include both GGSN (Gateway GPRS Support Node) and SGSN (Serving GPRS Support Node). | GTP: GPRS Tunneling Protocol | | LAN: Local Area Network | WAN: Wide Area Network | | FTP: File Transfer Protocol | SFTP: SSH FTP | | FTAM: File Transfer Access and Management Protocol | MML: Human-Machine Language | | UGW: Uniformed Gateway, a term which is used to include both S-Gateway (Service Gateway) and P-Gateway (Packet Data Network Gateway). | | - SGSN
The SGSN is an NE device that provides the packet data service. Its main function is to forward the input/output IP packets for the MSs in the local SGSN service area. The CDRs produced and transmitted by the SGSN are mainly used to collect the information about the use of wireless resources. The CG9812 receives the CDRs from the SGSN through GTP. - GGSN
The GGSN is an NE function entity that provides the packet data service. It supports the routing and encapsulation of data packets between the GPRS/UMTS network and external data networks. In the postpaid service, the CDRs produced and transmitted by the GGSN are mainly used to present the use of external networks. The CG9812 receives the CDRs from the GGSN through GTP. | 
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