Dear SIP experts, I've set up XTen clients on the two hosts, one on the simple Windows host, and another to VmWare virtual machine, which shares the single IP with the Linux host through the NAT. There are no login problem with login on the stand-alone Windows, but there are with the Windows under VmWare, where Xten complains that `Login time out'. I guess the problem is not connected to the Xten, but with the SIP clients under NAT et all. However, two my friends sit behing NAT too (although, on the standalone Windows hosts, not VmWare's), and they are both have no problems with logging, and even with talking to each other. Thanks a lot for any suggestions! -- Best regards, Timur V. Elzhov COO Warelex LLC