We have Cloud fax set up through CallTower using their CloudFax product.
To send a fax from the 425-814-6003 number a user needs send as rights on the Info@sequoyah.com eamil address. They send an email from Info to "FaxNumber"@ctcloudfax.com and a confirmation or reply will come back to the Info mailbox.
A user can be set up as a send only user on the Call Tower side so they're recognized as coming from the same number but replies still come to the Info mailbox.
https://info.calltower.com/hubfs/CT%20Cloud%20Fax%20Brochure.pdf