Telecommunications depends on what you want to know. But I saw a bunch of other IT guys in the research thread I would imagine that most have some form of teleco experience. I have a fairly good grasp of wireless communication in particular in the area of CDMA. I have worked for Air Touch Cellular, Kyocera Wireless and Qualcomm. I have worked with PBXs, VOIP, ISDN lines, ect. The key thing being if no one else steps up I probably have enough knowledge to know where to go look to find out what exactly it is that you need.
Unfortunately rockets on the other hand not so much.
Also obviously while I am very bright and a very capable researcher, writing in itself is far from one of my strong points.