You have the option to choose which phone number(s) you want to use to send and receive faxes with.
It's only possible to use phone numbers that have not already been allocated to other devices, as assigning a number that has already allocated will only remove it from the device that it's currently associated with.
To add a number to a Group or User's Fax Device:
- In your account settings select the intended User or Group;
- On the left hand side, click the Fax menu;
Under Fax numbers choose the number you wish to receive faxes with by clicking Assign Phone Number (administrators only)
In the Outgoing Caller ID section select the number you wish to display as the sender;