We're hoping to hook our fax machine up to our UC520. We want to set it up so that incoming calls on that line go directly to the fax machine, I know how to do that. I also want the fax machine to only use our dedicated fax line. Could you please let me know how to set the UC520 up so that it only uses our fax PSTN line. Also, do I need to do anything special since this is a pulse based line, not a tone based line. All of our other pstn lines are tone.