Is it possible to use headset with my JabloPhone GDP-04?

Yes, it is. You can use a connector adaptor RJ-11 ↔ 2x 3,5 mm jack (buy here) and normal PC-compatible headset with two separate connectors for MIC and HEADPHONES.

1. 1. Disconnect the receiver cable from the phone and receiver. Leave the receiver on the phone.

1. 1. Connect the adaptor to the phone.

1. 1. Connect your headset to the adaptor.

1. 1. You should end up with this:

Now you have to enable the headset support in the phone.

5. 5. Go to Menu of the JabloPhone and select Settings → Service → Code entry… → and enter HEAD1 to toggle on the headset support (for toggling off the headset support enter code HEAD0)

5. 5. Or use JabloTool desktop SW (download here) – connect your JabloPhone via USB to your computer, select Configuration → Advanced → tick Headset support

5. For making, receiving or ending calls please use green tick button and red X button or spacebar.