发明名称 |
Device and method for detecting presence of service on telephone line |
摘要 |
A device and a method for detecting presence of service on a telephone line prior to and during activation of alternative service on the line. The method comprises performing a first voltage detection on a subscriber line (S20), activating a subscriber line interface circuit (SLIC) if no pre-existing service is detected (S30), the SLIC providing an interface between the subscriber line and a service provider, and performing a second voltage detection on the subscriber line after a usage-dependent time has elapsed (S60), the time being determined by heuristics which consider several factors, including usage history of the line and time of day.
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申请公布号 |
US2004165718(A1) |
申请公布日期 |
2004.08.26 |
申请号 |
US20030372733 |
申请日期 |
2003.02.24 |
申请人 |
RAMEY BLAINE EDWARD;WITTMAN BRIAN ALBERT |
发明人 |
RAMEY BLAINE EDWARD;WITTMAN BRIAN ALBERT |
分类号 |
H04M1/00;H04M1/24;H04M3/00;H04M3/30;H04M9/00;(IPC1-7):H04M1/00 |
主分类号 |
H04M1/00 |
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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