FAX not working to one number

I have a strange FAX issue, where a FAX machine connected to a VG224 can sen
d/receive FAX to any number but is not able to send one outside number a FAX
. It can receive FAX's from them fine, just not send. The FAX machines phone
 or a phone plugged into th
e FAX phone line can call the # fine so there is not a CSS issue, etc.

The FAX machine is plugged into a VG224 with IOS 12.4(11)T , the VG224 is co
nfigured as SCCP (stcapp) and we have tried setting the port capabilty to mo
dem passthrough and not with no change.

The PSTN Gateway is a cisco 2821 with a PRI, it is MGCP and running IOS 12.4
(9)T and has FAX relay disabled.

We have tried 7 different FAX machines of different models and neither are a
ble to call this particular outside FAX machine when going over IPT. When th
e FAX machines are plugged into a traditional analog circuit there is not a 
problem and the FAX works f
ine.

Any ideas?

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