I have set up a ILS server on windows 2000 and have cable modem internet connection from local ISP (Singapore). When that ILS server is on, I can get IP address to log in from different location locally (in singapore) and can do Netmeeting conversation. But it sucked me out, when my overseas friends got connected to ILS server. They get listed in ILS server, where I can see who has logged in. But problem happened, I can not call them even though I am hosting a meeting nor they can call to host, even though they have logged on to ILS server. Is there firewall blocking from their end? Or other ISPs are blocking or filtering?