First thanks for the help you all gave to me... Nat/ports... When your endpoint (openphone) is behind the firewall/adsl/nat it can contact the gatekeeper easily because the nat translates the outgoing packet to the gatekeeper but the problem arises when the answer that is originated to the gatekeeper using UDP, tries to reach the endpoint... So when you have only one endpoint behind the nat, is easy, just program the nat box to reverse translate udp ports xxxx, yyyy to the internal address of the endpoint... In my case, I set up the windows box to open a vpn using pptp to the gatekeeper box (in my case running FreeBSD) so that in the vpn created this manner the endpoint is connect in the gatekeeper directly using the vpn tunnel... and in my case it turns out to be a good solution, as I do not have to worry about reprogramming the firewalls and nat.. that sometimes I do not have access.. besides, you can use several endpoints in your internal network registered in the same gatekeeper... (but I prefer using another gatekeeper to make proxy in the internal network, using openvpn, for example) or in my case using ppp over tcp...(that is the freebsd box (with the gatekeeper), inside the firewall) connects to the gatekeeper outside using a ppp over tcp that is native from the FreeBSD box... Hope this can help, Sergio ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________________ List: Openh323gk-users@xxxxxxxxxxxxxxxxxxxxx Archive: http://sourceforge.net/mailarchive/forum.php?forum_id=8549 Homepage: http://www.gnugk.org/