20 Most Recent NorStar Nortel T7406 6 Button Cordless Telephone w/ base and 1 Handset NT8B45AA Questions & Answers

what is wrong?

Try unplugging the base, then wait 1 min, then plug base back in. Once base is plugged back in re-associate the handset with the base by placing it on the base.

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Confirm Battery has enough Charge to Power ON the Device[Ensure Battery is not damaged].OR try to Charge Battery with External Charger/by any other Phone.Then Insert battery and make Charging with the Charger.Confirm Charger is in GOOD working Condition and Properly Plugged in.Still have Problem it might be Due to Some Hardware Problem need to make Manual Repair....
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Seems to be a known issue. The normal way is to disconnect the main control box unit. There is a video in the link https://www.google.com/search?q=wo+lines+stuck+on+a+Norstar+phone ..

Check handset cords

Set System Time 1-Feature **TIME 2-Password: BASIC 3-Change time as prompted in the display

You are probably inadvertantly did a busy station signal to sta 24 and are still queued up to it. Call 24 AND have them ANSWER to clear it. You may have to do it multiple time as most systems will allow 8 stations in the queue

Does it light up? Does the speakerphone work? Have you swapped the cords and handsets?

I'm have trouble seeing through the internet and do not know what make or model you are referring to? Have you tried being ON THE HANDSET and then pressing the handsfree/speakerphone key?

Make sure its plugged in right.