We have 2 GN 9120 headsets that needed battery replacement. We ordered some from Amazon & never could get them to work. They actually worked for a half day and then stopped working all together (never being able to get them to re-pare). I called Jabra and they asked me to state the text on the bottom of the battery, turned out the batteries were over a decade old so they suggested I return them. We got new replacement batteries. I replaced them, got both headsets to pare/sync correctly however the battery light has been blinking for over 24 hours and now the headsets aren't even pared anymore, they haven't been used since the new batteries have been put in. The battery light just keeps blinking. When I tried to re-pare them nothing happens, again the battery light just keeps on blinking. I don't understand how perfectly working headsets are now not working after replacing the battery,. Any guidance would be greatly appreciated!

SOURCE: GN 9120 Headset

Hold down the middle button on your headset for 6 seconds until you hear a series of beeps. Then hit the + sign about 2-3 times and then press the middle button again to disconnect. This should fix the issue. Make sure to call someone to test this as you may have just turned the volume up way to high. If that is the case, then you need to repeat this process using the - button instead of the + button.

SOURCE: GN Netcom GN 9120 - can't hear

Hi There, I had the same problem with a headset one of our call centre reps were using. It's usually due to some one fiddling with the button. I got it working by removing the battery from the headset then resinked the headset to the base unit. Hope it works for you

SOURCE: Cannot hear anything out of the earpiece of my GN netcom 9120 wireless headset

I was also experiencing the same problem (also after a power failure / storm) -- apparently good battery charge, connections ok, etc. I then tried removing the battery from the headset itself, waited 30 seconds, and then reinstalled the battery. This seems to have resolved the problem.

It is fairly easy to open the clamshell, but you will need a very fine Phillips screwdriver to remove the battery hold-in (it's really not a hold-down, it just keeps the battery in place. Reassemble the same way -- be sure to keep positive to positive and negative to negative.

SOURCE: GN 9120 beeps constantly

Are you using the GN1000 Handset Lifter? And if so, are you playing music/radio through the speaker of your telephone? If this is the case the Lifter will be picking up the sound of the music coming from the telephone and interpreting it as an incoming call, hence sending a signal to the earpiece in the form of beeps. Just stop the music coming from the telephone and the beeps should stop.
If you are not playing music through the telephone, you may need to turn down the sensitivity adjustment on the back of the Lifter. Just turn the knob anti-clockwise a little bit and see if that eliminates the beeping. If the sensitivity adjustment is too high it will pick up every little noise that goes on around your desk and interpet them as the phone ringing.

If you are not using the GN1000 Handset Lifter, then the beeping may be the result of a sticking/stuck volume button on the earpiece. If you adjust the volume on the GN9120 it gives a beep when you reach the maximum or minimum volume. If a button is stuck down it will result in a constant beeping. A stuck button is generally not a user servicable problem, however a little bit of tinkering with the button may get it unstuck.

SOURCE: The blue light on my base unit is on but the headset does not app

Unplug the unit -- Then grab the ear peice, and slide off the battery, wipe off the metal prongs ...leave apart for a couple minutes, then put back together. Make sure you plug the unit back in. It will take a couple hours for the battery to charge. But this should solve your issue.