So is there a way to do this? Can I route the 1 FXO to FXS for incomming calls (and plug fax into FXS) or something like this and then use that line as an outgoing line when not in use?
I don't need step but steps but the basics of how something like this could be configured would be awesome!!!
We can control the behavior of the inbound call by adding a route for that specific FXO Line and pointing it to the FXS port. The challenge is we don't currently route out specific FXO ports for outbound calls when you dial a steering digit such as a 9 to make an outbound call. The selection order is from lowest available port number first. This may cause confusion if someone wants to return a fax and the caller ID on the far end fax machine is a different phone number than your fax number.
We have seen several similar feature requests for what you are asking and I think the engineering team is looking at it for a future feature release. It might be best to leave the fax on its own dedicated line.