This Recommendation specifies requirements and capabilities of next generation network (NGN) evolution for supporting authorized account messaging service@ in order to enable a NGN end user to subscribe a profile of the entity (third-party provider) for accessing the information via messaging exchange. This Recommendation introduces a basic scheme and business roles for authorized account messaging service support in NGN evolution@ and it also specifies the requirements and the capabilities of authorized account messaging service in NGN evolution. Relevant scenarios for authorized account messaging service are provided in Appendix I.