Do you have MFD's with scan-to-email? You can use those to funnel faxes to an XMediusFAX server. This is a pure IP solution that woudl allow you to eliminate ATA's altogether. This also gives you an audit trail on all documents in and out of your ...
Analog fax (T.30) is tricky at best. You might consider using a T.38 fax server software solution that could utilize your gateway(s) to send and receive faxes via IP to the gateway (as opposed to an analog codec) eliminating the need for ATA's altog...