Hi, I have a pbx (elastix) with asterisx and linksys spa3102 to get call in and call out with my landline(pstn), and everything works perfect. The problem is that I can't send or receive fax from pstn line to my pbx or faxmachine connected to spa3102 fxs port. I try to send an internal fax from fax machine connected to fxs port to virtual fax(iaxmodem) and it works perfectly (got it in my email). So I think the problem is the conversion of the spa3102 from pstn line to pbx. Does I solve my problem with X100P? Or do you have some suggestion for me? How can I connect the pstn line to pbx for getting faxex? It will be very helpfull for me. Best regards.