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 type application server in a packet switched part of a telecommunications network system, said call controlling session initiation protocol type 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 type application server receiving a call termination message from at least one media gateway control function type network node in a circuit switched part of said telecommunications network system, wherein said call termination message comprises call detail record (CDR) data comprising all relevant charging information for said call;
• and
• said call controlling session initiation protocol type application server generating a call charging record for enabling call charging for said call.

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

• said extended services session initiation protocol type 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 type application server providing an instruction to a media gateway control function type network node serving said at least one terminal unit in said circuit switched part to include call detail record (CDR) data, comprising all relevant charging information for said call received from said circuit switched part, in a call termination message to be sent by said media gateway control function type network node to a call controlling session initiation protocol type application server in said packet switched part.

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

• a receiving unit 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 unit for providing an instruction to a media gateway control function type network node serving said at least one terminal unit in said circuit switched part to include call detail record (CDR) data, comprising all relevant charging information for said call received from said circuit switched part, in a call termination message to be sent by said media gateway control function type network node to a call controlling session initiation protocol type application server in said packet switched part.