SBS 2003 Faxing - Sharing a phone line with a fax machine

I have an SBS 2003 server and I want to set up faxing. I am only going to be using it to send faxes from within applications. Receiving will still be done at the dedicated fax machine. I just want to stop printing off hundreds of pages just to fax them.

I would like to have the fax machine and modem on the same line. I can set the fax machine to answer on the first ring, will that be sufficient for SBS to not answer? And if my users are sending a fax and SBS tries to dial but the line is in use because the fax machine is receiving, will it fail or try again?

Thanks