In such cases PGW should generate local CDR which should be then transferred to a mediation system. Mediation system will then analyze the CDR and charging can be done
You can check specification 3GPP 32.298 and 3GPP TS 32.299 for detailed information
Regards, Peeyush Sharma
I am curious to know in what way operator would like to charge voice calls by using VoLTE ? Is bearer level charging or application level charging ?
Which parameter is used by the PGW to resolve the subscriber location? Does it consider the "User Location Information" IE or the source-IP address?