Hi. I've been looking for simple solutions to this everywhere and can't get a clear answer on anything related to business phones (Everyone is only interested in cell phones now) so I guess I need to post in a business forum... My office has three telephone lines and a bunch of 3-line Panasonic business phones from the 80's. They all work fine, but my boss wants caller ID as well. I've been looking for Caller ID boxes that can be attached to these phones, but they all seem to be for single line phones. My next solution was to just get one new multi-line phone with caller ID built in (We only need one since it would be used more for storing numbers than screening). While looking on Amazon, I couldn't find one that got consistent reviews and some of the comments even lead me to believe that if I get the wrong phone, the ones we currently have won't work with it. Does anyone have a decent and preferably cheap phone with built in Caller ID support to recommend that has 3 or more lines? What do you guys use?