Recently I added some headsets (Jabra PRO 9450) to a range of LG LIP-8012D and LG LIP-8024D phones.

1. The electronic hook switch plugs into the back of the handset, with the coloured strip (usually indicating pin 1) facing up. It’s best to remove the power, add the accessory, then plug it back in, otherwise, the phone won’t recognize the accessory.
   A second cable for audio is required from the headset port on the back of the phone to the base use of the headset. (only control signals are sent down the electronic hook switch cable)
2. The handset requires programming to be told to use the handset and not the speakerphone.
   Trans PGM > 6 > 1.
   Select 0 for headset then Hold/Save.
3. The handset requires programming to be told to ring in the headset:
   Trans PGM > 6 > 2
   Select 2 for headset or 3 for both, then Hold/Save
4. That’s about it. Enjoy