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I have a 2 phone jacks, I get a dial tone for 15 seconds then the recorded message saying "please hang up...." my wife tells me, that we blew a fuse in that room the other day. I have checked the connections and cleaned them.
Do you have a newer interface, The outside box the incoming phone line connects to? You can open it, unplug the one plug, and plug a phone into it. If it then works, the trouble is inside. If not, it is the phone company.
Labman, go off hook for 15 seconds, My phone works fine, If I do nothing for 15 Seconds,
I get the same recording.
Thomp, testing outside as Labman says can verify Telco or House wiring. I think you will get same recording?
Call your house from another phone, if it rings busy while your home phone on hook, ther is a short on the line or excessive resistance. Also try unplugging all phones but one.
Then try a different phone, in case that phone is bad.
Also look at gold contacts on phone jack, should not be black, green or corroded.
Clip voltmeter to red and green, You can see when on or off hook. Aprox 48 volts DC, On hook.
6-9 volts DC Off Hook. Maybe around 90 Volts AC for ringing. Watch voltage, and you see switching.