Definition of:ULS server ULS server  (User Location Service
server) A conferencing directory server on a TCP/IP network
(intranet, Internet, etc.) that is used to identify
participating users. When an audio or videoconferencing program
is launched, it sends its user profile and current IP address to
the ULS server, so that others can query the server and find out
who is currently logged on. Microsoft renamed its ULS servers to
ILS servers (Internet Locator Server), and Netscape Conference
used DLS servers (Dynamic Lookup Service). See IP telephony.