This project provides a 3GPP-compliant Charging Gateway Function (CGF) as a sink for SGSN/GGSN/etc streamed CDRs on the 3GPP Ga/Gz interface. Refer 3GPP 32.295. These are common data elements of GSM/UMTS mobile telephone networks. This is part of the toolkit developed by 3G Telco Tools.

The CDRs are streamed over the GTP' (GTP-prime) protocol, a subset of the main GPRS Tunnelling Protocol (GTP) protocol used between the SGSN and GGSN.

open-cgf implements all the features of 32.295 although not all SGSN/GGSNs implement, and therefore exercise, these features. It is not yet clear if any CDFs (GGSNs/SGSNs/etc) implement the special sequence number/duplicate-avoidance features described in this standard.

See the Wiki current project status

Contributions and feedback, including traces from your network, are welcome and appreciated. Send them to feedback@3gtelcotools.com