Conference Calling Service Description - Integrated Services Digital Network (ISDN) - General Structure and Service Capabilities (Study Group XVIII) 19 pp
国外标准现行
标准号:ITU-T I.254. 1-1988
标准名称: 会议呼叫业务描述-ISDN补充服务-普通结构和服务能力 研究组18 19pp
英文名称:Conference Calling Service Description - Integrated Services Digital Network (ISDN) - General Structure and Service Capabilities (Study Group XVIII) 19 pp