Who's On the Phone

I have setup a small office with Asterisk. We currently have 7 users with Grandstream GXP2000 phones. I want to have a way to tell if someone is on DND or on a line. Can I program one of the 7 “side” indicators for each or is there a web-based utility that I could use to detect the state of each user in real-time?



We have been usin FOP for this see link