FaxBack Connector for Microsoft Fax - Configuration Guide For Windows Server 2008 R2 - Manual (Page 2)

Microsoft Fax Connector Configuration Guide for Windows Server 2008 R2 — Page 2
Bring up the Server Manager and choose to add a role.
Choose the Fax Server role.
It will automatically try and add the Print and Document Services – Print Server Role. This is required as well.
Accept those and click next. It will bring up the screen telling you more about the Fax Server role.