If like me you are having problems wih your Jabra in that instead of your headset, voice audio comes from the TV audio, here's a solution I found at the Playstation Blog forum.
Ok, first off when turning the Jabra headset on/off you need to press and hold the button untill the blue light flashes about three times fast. Hold the button untill this happens for both turning it on and turning it off. Second, this headset seems to disconnect constantly, when you join a game wait till it starts and when it does press the call button on the headset to get it to sync up. You should start hearing others talking through the headset, if they are still coming through the tv press the button again. Once the headset is synced up press and hold the L3 button on the sixaxis to talk, you don't need to hold it if you're not talking. This could also be used as a way to see if the headset has synced up, after pressing the call button on the headset press and hold the L3 button and ask if anyone can hear you. Plugging a headset into the tv will not give you the ability to talk to others in the game, all that does is direct the audio coming from the speakers on the tv to go through the headset instead. As far as charging goes make sure it has a full charge. If you think the charge might be low then plug it in.
NOTE: You should see a speaker sign beside your name (top left corner) if you are connected and when you press L3 to talk, there'll be a beep coming from your TV to signal you're "on the air" another beep when you release
Thanks to redeagle28 from the forum (linked)