I believe this is a general problem for protocols that carry IP addresses in the application level, like FTP. I would think an H.323 proxy would be needed in this kind of environment.

Gene Schroeder Lucent

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From: Tom Taylor Tom.Taylor.taylor@NT.COM To: ITU-SG16@MAILBAG.INTEL.COM Subject: Potential Addressing Issue Date: Thursday, December 18, 1997 12:48 PM

I was going over my notes for the IETF MMUSIC session last week, and came across an item which may be an issue for H.323. Thanks to the presence of Network Address Translation (NAT) in the net, an endpoint doesn't necessarily know its true network address. (NAT boxes translate between local addresses and public ones invisibly to the hosts concerned.) Thus the address an H.323 endpoint sends out during registration with the Gatekeeper may be bogus.