>3. IP to IP call is possible in 2.2 beta 4 or 2.0.7? In both. >I am using radius authentication,whenever I do pc to pc call,it rejects. You need to modify server you are using to recognize pc to pc calls. >when I dont use radius..the scenario is GK on public IP and both ends r behind NAT.....then can they make pc to pc call.??(proxy is not enabled).GK is in routed mode. No. Unless NAT is configured to forward approtiate ports and the sofware uses fixed port ranges (or both software endpoints know how to traverse NAT with GnuGk in proxy mode). >4. If one is behind NAT and other end point is on public IP,then person on public IP can make call to NAT behind person(same GK is on public IP with no proxy.) No. Unless NAT is configured to forward approtiate ports and the sofware uses fixed port ranges (or software endpoint behind NAT knows how to traverse NAT with GnuGk in proxy mode). ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click _______________________________________________ List: Openh323gk-users@xxxxxxxxxxxxxxxxxxxxx Archive: http://sourceforge.net/mailarchive/forum.php?forum_id=8549 Homepage: http://www.gnugk.org/