We are using 3CX v15 SP4. We have noticed that the fax extensions are not able to accept another call while a fax is being received. On a regular extension (under Forwarding Rules), we can set the extension to “Accept multiple calls”. This is not an option with a fax extension. Please add this capability with fax extensions. We can only have one fax forwarding option configured on our fax machines. Our fax machines are currently configured to fax forward to the network, which saves the fax as a .pdf on the network rather than killing a tree and having PHI sitting on fax machines in printed form. Because the fax machines are configured for fax forwarding already, we do not have the option to fax forward to another machine when the line is busy.