Transmission of the Answer Signal - General Recommendations on Telephone Switching and Signalling - Functions and Information Flow for Services in the ISDN - Supplements (Study Group XI) 1 pp
国外标准现行
标准号:ITU-T Q.27-1989
标准名称: 应答信号的传送
英文名称:Transmission of the Answer Signal - General Recommendations on Telephone Switching and Signalling - Functions and Information Flow for Services in the ISDN - Supplements (Study Group XI) 1 pp