Connecting to a fax line using Modem

[makdu]

Hi,
I want to transfer data between 2 computer. the Receving computer has a fax modem.I tried to dial the receving computer from the send computer using Modem. The call is not getting estabished. I got an information that the telephone exchange wont allow data transfer to the fax line; ie the telephone exchange will cut the call when it see the data in fax line. Only fax data and voice call are allowed in the fax line. Is there a way to send the data making it look like fax data, so that the exchange wont detect that the data is not a fax data.