The ATA only supports fax pass-through in g.711 mode. When the ATA or gateway detects a fax tone, it should upspeed to g.711ulaw regardless of what codec the call originally negotiates at. If it isn't doing this, check the AudioMode and ConnectMode settings via the ATA web config. There's a document on CCO that explains the recommended setting and what the bitmask corresponds to.
FYI, H.323 and MGCP loads are end of engineering, so running SCCP is probably the wise choice if you care about development support.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.