Change Virtual Fax Sending Number

Hello, I have setup a virtual fax system for testing sending and receiving virtual fax between two numbers. My setup is: Virtual Fax A(VFA), and Virtual Fax B(VFB) both created, and VF Dial plan A set to detect > receive virtual fax using VFA, and another dial plan for VFB, with unique numbers assigned to those dial plans. Everything works just fine, I can send and receive virtual faxes through email from both of those numbers. However, when I send virtual fax from a number, the fax I receive says it was sent from the main line number, and not the unique number assigned to the dial plan, is there any way I can change the number that virtual faxes are sent from?