Cell Phone As A Modem For A Faxing

I have a Samsung VI660 phone for which I bought a data cable. I installed the drivers to give it the ability to act as a modem, and I'm able to connect to a dial up internet account using the cell phone as a modem. The problem is, I can't seem to get it send faxes, and I'm not sure if there is anyway to do this. I thought if the cell phone could handshake and establish an internet connection, it should also be able to handshake to establish a modem-fax connection. I confirmed that the fax machine I'm trying to send to is giving a handshake when the number is called. When I attempt to fax using the cell phone, I can see it dialing out, but it never establishes a connection.