Can I add a "Sent From" number in /Features/Fax? I see a drop down box, which lists my primary number (and would probably list a clone if I had one), but is there way to verify and add a number as there is with /Beta/Mobile?

Alternatively, I suppose I could use the BetaFax feature, which appears to allow numbers to be added. Can someone comment on the differences between fax and betafax? Thanks.