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How does a modem know which ISP to connect to? It doesn't. It just tries to connect to any DSLAM on the circuit. Your circuit has to be physically connected to the correct ISP at and by the telephone company itself. If you switched ISPs and the new ISP could not see your modem attempting to authenticate, it meant that the cross-connect hadn't been done ...


The first thing I would try would be to perform a factory reset of the device. In some cases, factory reset perform a firmware rollback to its original state (Before the ISP firmware). You can follow the guidelines on this page http://www.manualslib.com/manual/593169/D-Link-Dsl-2730u.html?page=17. If this does not work, I would try a hard reset, usually ...

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