Question about IBM Corded Phone IBM412CID

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Have already replaced 3 of the original 5 phones.. Three are working now but cannot get the other 2 to co-operate. I no longer have 4 lines into my home;only 2. Can't get a dialtone or sound when plugged into jacks but phones can be programed for correct ext.,date,etc. . I have changed connection lines from jacks to phones using muti lines or singles, NOTHING works. HELP

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  • janousfarms Jul 28, 2008

    I have read and re-read all manuals.


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Have you verified that the jacks affected have DT on them with another single line phone? If it doesn't, it could be a wiring issue between the NID (Network Interface Device) where you service comes from the pole to the house. This could especially be the issue since you have recently had lines DC.

Most NID's have a service jack where you can plug a phone in from the NID. This will bypass all possible inside wiring issues that may exist.

I would start from there and if you have dial tone at the NID. Then verify that you have jacks wired the same as the NID.


Posted on Jul 28, 2008

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Try disconnecting all phones from power, if it is a setting problem this will reset the system

Posted on Jul 27, 2008

  • Ginko
    Ginko Jul 27, 2008

    Try disconnecting all phones from power, and also disconnect the data jacks if it is a setting problem this will reset the system

    I donot know if I understood, What is the problem? do you lose dial tone when you plug data jacks in?
    Here is user manual for reference,

  • Ginko
    Ginko Jul 28, 2008

    I assumed you have the manual already if you have 5 phones, I posted the manual so we can have a reference.
    About phones, if you simply do not have dial tones on two on five phones, try first a different wall plug and phone cables (sure you did this already), just in case.
    Then make sure the line connection on the non working phones is programmed ON, if they had OFF in this memory setting, they won't connect to phone line.
    If this is not the problem, the phones are faulty " line connection " is the only setting that can cut off phone line.


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