Home / Standards / GB/T 5444-1985 GB/T 5444-1985 Active The test methods for the technical specifications of subscriber line signalling for automatic telephone switching network 电话自动交换网用户信号技术指标测试方法 Standard Type GBT ICS 33.040.30 CCS M15 Status 现行 Issue Date 1985-10-30 Implementation 1986-06-01 Responsible Dept 工业和信息化部（通信） Drafting Unit 工业和信息化部（通信）