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经营范围
发明名称
Toll-free service in an internet telephony system
摘要
申请公布号
EP1113677(A3)
申请公布日期
2005.06.22
申请号
EP20000128206
申请日期
2000.12.22
申请人
AT&T CORP.
发明人
KUNG, FEN-CHUNG;RUSSELL, JESSE EUGENE;SANKALIA, ANISH;WALKER, HOPETON;WANG, SPENCER
分类号
H04Q3/00;(IPC1-7):H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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