Guys I would just like to let you know that GnuGk 2.3.1 (CVS) and H323plus 1.21 (CVS) now support the complete H.323 NAT Traversal solution. This a major step forward for both projects and H.323. I have built a sample windows installer for GnuGk and MyPhone (CVS version) for demonstration purposes. GnuGk Windows Installer (Win2000 or above) www.h323plus.org/standards/GnuGkSetup231.exe MyPhone Installer (XP or above) www.h323plus.org/standards/MyPhoneSetup121.exe Any queries then please address them to the appropriate mailing lists. Details for what the standards do: H.460.18 Mechanism to enable registration and call signalling traversal across a NAT/FW H.460.19 Mechanism to enable media traversal (proxying) across a NAT/FW H.460.23 (ITU approval in November) NAT detection and classification H.460.24 (ITU approval in November) Point to Point Media through NAT. Allows media to traverse NAT/FW without the need to proxy media (disable H.460.19). H.460.24 Annex A Same NAT RTCP probe. Extension of H.460.24 to allow endpoints behind the same NAT/FW to probe for direct connectivity. The standards documents are available from Packetizer. http://www.packetizer.com/ipmc/h323/standards.html http://www.packetizer.com/ipmc/h323/doc_status.html Simon