ETSI TS 183 066-2009 电信和互联网融合业务及高级网络协议(TISPAN).网络附属子系统(NASS).基于直径协议的a4接口(版本2.1.1)
Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Network Attachment Sub-System (NASS); a4 interface based on the DIAMETER protocol (V2.1.1)