I have some NEC DTH phones with the directory button to scroll through caller ID's, I also have some NEC DTU phones that don't have a directory button. Can a program a line key for the directory feature on the DTU phones
You should have soft keys in the display. If you look in the display and see words at the bottom of it, than the keys under each word will do the function it says. One should say DIR, this is the directory key and should show caller id, or one should say cid. You can prgram a scroll key but need to know how to enter program mode and program the feature. ldtsnj.com
The simple answer is no
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