Generally fax over ip is not very reliable when going over FXO POTS lines. You may need to play with the gain and output attenuation settings to make sure audio is loud enough on the fax machine and that there are not any echo. Also superG3 is not supported with ATA because it uses v.34 modulation and ATA does not support modems.
Thanks for the feedback. We're not trying to run superG3 or any such weird crap, and all traffic will be contained within a QoS-enabled LAN. I'm hoping I'll be able to get away with this, specifically with the newer version of the ATA186 which has improved support for faxing.
If all else fails, we'll at least have an ATA we can use old POTS phones with.
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