Ours is just whoever gets there, and it can be done from the station (intercom) or going into the room. The techs are supposed to answer lights but they get busy doing other stuff (and don't want to, haha), and a lot of the nurses do it. The problem is, they say that on our unit, they expect every person to answer every light. Even if you are an RN and the light that is on is not one of your pts, you are supposed to answer it. The problem with that is, when you are knee deep in stuff with your own pts, how are you supposed to deal with other people's pts?
This is one of the biggest complaints we get - that lights aren't answered fast enough, but I don't know that our pts don't expect too much of us. They tell us to tell them on admission that we will respond within 5 minutes. That would be great. But last night I was elbow deep in a wet-to-dry with packing, all sterile and all that, and my tech came in and said, "so-and-so wants pain meds". I said okay as soon as I'm done here. But it was at least another 15 minutes (she had another dsg also that I hadn't done yet, and I couldn't just leave her in the middle to go give someone else pain meds, and my charge nurse was busy) before I finished in there and then by the time I washed my hands and got the pain meds, that pt had to wait about 20 minutes. She was not happy, and I hate to make them do that, but they don't seem to understand that we aren't just sitting at the station reading magazines, waiting for them to call out.
Our unit gets mad because they can't find us. We have the technology available for two different nurse-tracking systems, but will they pay for it? No. So we get little magnets to stick outside of our rooms so that everyone knows where we are at all times. Stupid!