You mentioned that you are able to receive inbound faxes from the PSTN, correct? Is the sending fax machine in your failed scenario attached to the pstn gateway? I'm just trying to get a feel for any differences in network topology for the working vs. non-working scenario's
Can you post the relevant config for the sending fax gateway as well? Keep in mind that the fax transport method for the originating and terminating gateway's must be the same.
Also, please provide your IOS versions, as an IOS bug is not out of the questions.
If you can, run the following command on the originating gw and the vg while the fax is transmitting:
'show call active voice br'
You'll need to run the 4 or 5 times to make sure we get all pertinent info (dropped/early/late packets, delay, proper switchover, etc)
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