how to set fax number using print object

Question

we have printer RICHO AFICIO 2045 S/P model. It has faxing feature also (Ricoh LAN-Fax M3). We fax the document the same way as printing document except, we have to set the fax number in the PRINT properties window as we set the number of copies.
The problem is we have to fax 1000s of documents, so we have to open each document manually and set the fax number to fax it.
Is there a way to automate using c# and using print object.
How to set the FAXNUMBER as we set the number of copies programmatically?
FAXNUMBER property does not show when using PrinterSettings() object.
Pls help.