The other party must have hardware or software installed that allows the sending and receiving of color faxes. As a software, the other party can use Venta Fax & Voice to send and receive color faxes. Note that Venta Fax can also operate at PSTN line together with hardware modem.
If the receiving fax machine does not have color fax support, color fax software usually converts a color fax into a black-and-white version automatically at the time of transmission.