Hi there, I am a new-bird in the VOIP applications , and I would like to clear some basic doubts. Basically I would like to know, why the H323 clients do not work behind the NAT or the proxy network ? I understand that the H323 non compliant clients like net2Phone are able to talk to the PC which r behind NAT but the H323 compliant applications like netMeeting , I am not able to communicate people behind NAT-Proxy network . why and what it can be preventing that these applications are not able to pass audio behind the NAT? Thanks n Regards, Santosh Kadam. e-mail: san@siliconportals.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ For help on this mail list, send "HELP ITU-SG16" in a message to listserv@mailbag.intel.com