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发明名称
Dual-tone multi-frequency signal transfer protocol
摘要
申请公布号
EP0851692(A3)
申请公布日期
1999.03.17
申请号
EP19970308008
申请日期
1997.10.10
申请人
AT&T CORP.
发明人
LAM, CHI K.
分类号
H04L27/26;H04L29/08;H04M3/42;H04Q1/45;H04Q1/453;(IPC1-7):H04Q1/453
主分类号
H04L27/26
代理机构
代理人
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