CDR Transport through GTPP

GTPP delivers Charging Dara Records (CDR) from the Charging Data Function (CDF), which generates CDRs to the Charing Gateway Function CGF(s). The GTPP protocol is required if the CGF resides outside the CDFs. It utilizes some aspects of GTP, which is used for packet data tunnelling in the backbone network.

GTPP operates on the Gz interface and peforms the following functions:

  • Transfers CDR between the CDF and the CGF.

  • Redirects CDRs to another CGF.

  • Detects communication failures between the communicating peers, using echo messaging.

  • Advertises to peers about its CDR transfer capability. For example, after a period of service downtime.

  • Prevents duplicate CDRs that might arise during redundancy operations. If configured, the CDR duplication prevention function is carried out by marking potentially duplicated CDR packets, and delegating the final duplicate deletion task to a CGF, or the Billing Domain.