ITU-TQ.22-1989带内信令所用的频率

标准号:ITU-T Q22-1989
标准名称: 带内信令所用的频率
英文名称:Frequencies to Be Used for in-Band Signalling - General Recommendations on Telephone Switching and Signalling - Functions and Information Flows for Services in the ISDN - Supplements Study Group XI; 1 pp
标准类型:国外标准
标准状态:现行
中国标准分类号(CCS):M19
