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发明名称
IP telephony service system and method
摘要
申请公布号
GB0409478(D0)
申请公布日期
2004.06.02
申请号
GB20040009478
申请日期
2004.04.28
申请人
NEC CORPORATION
发明人
分类号
H04M3/22;H04M15/00
主分类号
H04M3/22
代理机构
代理人
主权项
地址
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