V15.5.1694.0 We have a SIP trunk with 6 DIDs. The DIDs are provisioned with COX so that if our PBX doesn't answer they automatically roll to an answering service. 3CX is configured so that during business hours any calls are sent to a ring group which if not answered goes to IVR. After hours it goes directly to IVR. If the person requests immediate assistance from the IVR, it goes directly to an answering service. All of this is working with no problems. I then go to Settings -> Fax Server. I keep all the defaults except the email address. I add one of the DIDs and hit ok and when I dial the number it goes straight to the answering service. I remove the DID from the fax server and it goes to the IVR like it should. Try another DID (add to fax server) same thing straight to answering service. Wash rinse repeat for all the DIDs. What might I be missing?