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 (S 20 ), activating a subscriber line interface circuit (SLIC) if no pre-existing service is detected (S 30 ), 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 (S 60 ), the time being determined by heuristics which consider several factors, including usage history of the line and time of day. |
申请公布号 |
EP1597903(A4) |
申请公布日期 |
2011.08.31 |
申请号 |
EP20030800309 |
申请日期 |
2003.12.31 |
申请人 |
THOMSON LICENSING |
发明人 |
RAMEY, BLAINE, EDWARD;WITTMAN, BRIAN, ALBERT |
分类号 |
H04M1/24;H04M1/00;H04M3/00;H04M3/30;H04M9/00 |
主分类号 |
H04M1/24 |
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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