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- ITU-T Q.120-139 Specifications of Signalling System No. 4
【国外标准】 Specifications of Signalling System No. 4
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2025-10-22
- ITU-T Q.120-139
- 现行
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标准号:
ITU-T Q.120-139
标准名称:
Specifications of Signalling System No. 4
英文名称:
标准状态:
现行-
发布日期:
2025-11-01 -
实施日期:
出版语种:
- 其它标准
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