Method, network node and application service for making available call detail records in an IP multimedia subsystem type network

A method of operating a call controlling session initiation protocol application server in a packet switched part of a telecommunications network system, said call controlling session initiation protocol application server handling a call that is performed in said telecommunications network system between two or more terminal units of which at least one terminal unit is served through a circuit switched part of said telecommunications network system, said method comprising:

• said call controlling session initiation protocol application server receiving a call termination message from at least one media gateway control function network node in a circuit switched part of said telecommunications network system, wherein said call termination message comprises an indication that said call is being terminated and call detail record (CDR) data comprising all charging information for the circuit switched part of said call, wherein the charging information includes a cost of making said call;
• and
• said call controlling session initiation protocol application server generating a call charging record for enabling call charging for said call.

A method of operating an extended services session initiation protocol application server for enabling call charging in a telecommunications network system, said method comprising:

• said extended services session initiation protocol application server receiving, through said telecommunications network system, an indication of a call that is performed in said telecommunications system between two or more terminal units of which at least one terminal unit is served through a circuit switched part of said telecommunications network system;
• said extended services session initiation protocol application server providing an instruction to a media gateway control function network node serving said at least one terminal unit in said circuit switched part to include call detail record (CDR) data, comprising all charging information for the circuit switched part of said call, wherein the charging information includes a cost of making said call, in a call termination message to be sent by said media gateway control function network node to a call controlling session initiation protocol application server in said packet switched part, wherein the call termination message further includes an indication that said call is being terminated.

An extended services session initiation protocol application server for a telecommunications network system, said extended services session initiation protocol application server comprising:

• a receiver circuit configured to receive, through said telecommunications network system, an indication of a call that is performed in said telecommunications system between two or more terminal units of which at least one terminal unit is served through a circuit switched part of said telecommunications network system;
• a processing circuit for providing an instruction to a media gateway control function network node serving said at least one terminal unit in said circuit switched part to include call detail record (CDR) data, comprising all charging information for the circuit switched part of said call received from said circuit switched part, in a call termination message to be sent by said media gateway control function network node to a call controlling session initiation protocol application server in a packet switched part of said telecommunications network, wherein the call termination message further includes an indication that said call is being terminated, and wherein the charging information includes a cost of making said call.