Hi, I am new to this list and am facing a problem in the H323 connection tracking.I have been working on the H323 Connection tracking and NAT modules for the past few days. I applied the Newnat and H323 Patch using the instructions given in the page :- "http://roeder.goe.net/~koepi/newnat.html". My setup is as follows :- VOIP(Private)----LINUX (with patch)----VOIP(Public) I have one DNAT rule and a Masquerading rule setup. I establish one connection and RTP packets are transmitted properly. After I disconnect, if I try to dial immediately (from anyside,WAN or LAN), the connection tracking associates this call to the previous connection tracking and the source signal address inside the packet is not NATTED properly. So the WAN sends its RTP Packets to the Private address of the VOIP instead of the Gateway's WAN Address. After a duration of one minute, I am able to connect properly. How to destroy the expectation connection tracking on release from only one side. Any Hints ??? Thanx in advance for your help. Regards, Vidhya