I'm not exactly sure what type of answer you seek. With that being said, typically the safest and common method is a 1:1 NAT. If you are setting up or have set up a NAT rule for a specific port from and
Internet Business Fax to Email Made Easy -
With eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number.
You'll receive secure faxes in your email, fr…