
【国外标准】 Signalling between international switching centres and stand-alone echo control devices
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2025-06-10
- ITU-T Q.52
- 现行
- 定价:
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适用范围:
暂无
标准号:
ITU-T Q.52
标准名称:
Signalling between international switching centres and stand-alone echo control devices
英文名称:
标准状态:
现行-
发布日期:
2001-03-01 -
实施日期:
出版语种:
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