Ethernet connections will get the phone line fee waived. 322 receivers don't have the dishcomm feature built in so they will still need a phone line connection. Pretty much only the 622 and 722 are the ones where an ethernet connection will help. The 222, while dishcomm capable, doesn't yet have the software in place for it to use another receiver's phone or ethernet connection so for now it too will need its own phone line or ethernet connection.
All ViP receivers have the hardware necessary to be able to communicate back to dish as long as another ViP receiver is connected through either ethernet or phone line connection. Not all have the software though so you will want to exercise some diligence in addressing this issue.