5.1.5 IMS support of real-time tariff transfer

32.2603GPPCharging managementIP Multimedia Subsystem (IMS) chargingRelease 17Telecommunication managementTS

The TS 29.658 [206] describes the Real-time Transfer of Tariff Information (RTTI) in SIP. The RTTI may be supported for the requested service (e.g. tariff information of a value added service residing in the called network or in a specific AS).

According to the procedures described in the TS 29.658 [206], tariff information may be included in the content body of the following SIP messages: 1xx provisional response or SIP 200 OK at session setup, mid-dialog requests or responses. The following IMS Network Elements, IBCF, MGCF, S-CSCF and AS may pass tariff information and record the tariff information in the corresponding CDRs for IMS offline charging. For online charging, the AS and the IMS-GWF may send charging information related to the content body of RTTI message over Ro interface to the OCS.

The following security mechanisms shall be used for RTTI:

– IBCF shall accept RTTI information only from trusted IMS networks and filter out RTTI information from non trusted IMS networks.

– If RTTI information has to be sent over unsecure domain networks, the security of the domains interconnection shall rely on Network Domain Security specifications: TS 33.210 [208] and TS 33.310 [209].

– The S-CSCF responsible for the handling of RTTI messages shall follow the common IMS security specification TS 33.203 [207] to protect against malicious UE that try to bypass the P-CSCF.