ITU-T Q.85.6-1995
行业共用补充业务第2阶段描述:全球虚拟网业务(GVNS)
Stage 2 Description for Community of Interest Supplementary Services - Clause 6 - Global Virtual Network Service (GVNS) General Recommendations on Telephone Switching and Signalling - Functions and Information Flows for Services in the ISDN