Method and system for GSM billing during WLAN roaming

摘要

The invention relates to a method and system for recording and billing of services during roaming of a mobile IP node (20) in heterogeneous WLANs, in which first call detail records are transmitted from an access server (23/1001) to a billing module (1003) and second call detail records from the access server to a proxy module (1002). By means of a clearing module (1004), the obtained service is billed (1016) at a provider (1008) of a fixed network (1007) and/or TAP files (1017) are transmitted to a GSM (1005) service provider (1006) for billing.