Has anyone managed to get this to work without a patton gateway? We're trying to get it working with either a linksys PAP2 and or a GS-505, and have had no luck. We originally tried to configure an inbound SIP trunk to connect to the Special FAX Extension Number, but it failed. We then configured the inbound SIP to connect to an ATA which in-turn was connected via it's phone jack to another ATA configured in 3cx as a DID (PSTN) this gave us what we thouht to be the nearest results to success without really succeeding. We can connect to the ATA configured as the PSTN-DID, and it's status shows off-hook, but we never get the faxed email. It's hard to say if the ATA actually ever produced a carrier signal to respond to the inbound fax as there is no speaker on the ATA and all we ever hear is our FAX machine's carrier request. The call does get routed through the defined extension, but the second ATA when it goes off-hook never answers the call. We've tried changing the Fax Tone Detection Mode and t.38 mode on both the FXO and FXS ports with the same results. Anyone have any ideas.