Peace, brothers...
As I've said consistently: fax is a technology that needs to be put out of its misery. Faxing over VoIP is a crap-shoot; it may or may not work, depending on the quality of the transit carrier(s) (VoIP), and of the terminating (PSTN) carrier. For those situations where a business requires it, the best solution available today is to use a service that uses image files (TIFF, JPG or PDF) for input on send, and output on receipt. The cost-per-page of fax server/mailbox services is so small that it's not even worth debating.