For anyone interested:
U631 - ECM settings
U633 - V.34 settings
U650 - G3 settings
I was able to manually send a fax but couldn't get it to send on its own. I tried all different settings in those modes in various combinations without success.
What did end up fixing it was in U660 under EXCHANGE, I switched it from PSTN to PBX and it worked fine after that.
Thanks everyone for the help!
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