Is there any device you can put on a phone line to continuously or periodically draw a sealing current?
I'm thinking a DSL filter plus an appropriate resistor across the "phone" side might do it, but is there a better approach?
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Yes. Go buy an active sealing current terminator.
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Thanks. Any pointers for where? Google isn't being very helpful.
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The ones I see look like they're for dry lines with no voice (& thus no current source at other end).
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They are indeed for dry lines. Why would you need sealing current if you have a wet line? Your phone should be drawing enough current to prevent contact oxidation?
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... or to put it another way: Plug a cheap phone into your jack. That should be enough?
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There's no phone plugged in & that seems to be my source of periodic line failures. I guess getting a phone that draws some current even while on-hook would be an option.
End of conversation
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