We have some problems with H.323 videoconferencing in a private network segmented by various PIXen running OS version 6.3. Clients are Polycom PVX running on Windoze PCs, and the problem we are seeing is that clients in one of the segments cannot connect to those in any other segment. More precisely, the call is signalled but when the called party clicks on "accept" the call is not connected and the caller gets a "refused" message. This seems to be the normal behaviour if the connection traverses a PIX which still has the default "fixup protocol h323" settings in place, but we have double checked that all the PIXen in this network have no fixup protocol h323 h225 1720 no fixup protocol h323 ras 1718-1719 in their configuration, and with that, video connections work fine now, except for that one segment.
Any ideas how to troubleshoot this? (Without the trouble shooting back, if possible. ;-)