In the advanced section of your fax extension you need to enable, Fax Enabled and Fax to Email
For Outbound, you need to have your outbound route for your fax prepend 000038 to the number you are dialing, from the docs – https://support.skyetel.com/hc/en-us/articles/360040711554-T-38
Attaching my outbound route, you can of course ommit the last rule as that is area code specific for 7 digit dialing.
