发明名称 |
Secure detection of an intercepted targeted IP phone from multiple monitoring locations |
摘要 |
Secure monitoring of a target IP telephone may be obtained simultaneously at a plurality of monitoring stations by requiring authentication to be provided by each of the monitoring stations prior to granting access permission to monitor the call. A single request generates multiple duplicate calls to a plurality of different monitoring location, each of which must be authenticated. When the monitored call arrives at each of the multiple monitoring stations a password is used to achieve authentication permission. The password is entered at each monitoring station by a touchtone keypad that generates Dual Tone Multi-frequency (DTMF) signals (e.g., each signal is a combination of two tones at different frequencies) which is sent to an IP monitoring center, which grants surveillance permission.
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申请公布号 |
US6496483(B1) |
申请公布日期 |
2002.12.17 |
申请号 |
US19990376459 |
申请日期 |
1999.08.18 |
申请人 |
AT&T CORP. |
发明人 |
KUNG FEN-CHUNG;RUSSELL JESSE EUGENE;SANKALIA ANISH;WANG SPENCER C. |
分类号 |
H04L12/24;H04L12/26;H04L29/06;H04M3/22;H04M7/00;(IPC1-7):H04L12/28 |
主分类号 |
H04L12/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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