NEC DTU 16-1 Corded Phone Logo

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Russell Roberts Posted on Apr 23, 2007

Handset not working

One of my dtu 16-1 phone has developed a problem. It work fine on speaker but when the handset is lifted you can not hear of speak to the caller

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  • Contributor 11 Answers
  • Posted on Apr 25, 2007
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Joined: Mar 15, 2007
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Three possible problems - Bad handset, bad handset cord, or bad telephone. Try another handset and cord from a known good phone. If the problem phone still doesn't work the hookswitch spring may be weak. You can remove the screws from the bottom of the phone and take the bottom off. The hookswitch will have a small spring that you can stretch or rebend to put more upward force on the hookswitch to make it positively go off hook. Also the dtu phones have a jack for the handset and a jack for the headset on the bottom - make sure you are using the handset jack.

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Yes, the NEC DTU-16D-1A can be used with a standard PSTN line. You will need to program the phone system to recognize the PSTN line instead of the ISDN2 line. Here are some steps you can take:
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