Hi all, Just finalising my plan to ditch our ISDN PBX and move to 3CX. Our Internet connection isn't up to handling all our calls and until this improves I've decided to keep our ISDN line which also has a DDI for inbound fax. I've tested this for inbound fax through the SN4120 to 3CX fax server and it works fine. We still have an occasional need to send a fax from a stand alone fax machine. Could I connect a fax machine to and Obi100 and route the outbound fax over the ISDN? Thanks in advance. Rob.