The 5540 works like any other phone, and can be a Teleworker (I assume, I haven't actually tried it remotely, but the MBG supports it so it should work and it has the Teleworker menu)
Just press and hold 7 while plugging in the power/PoE connection, should come up with the Teleworker menu, I know I have done this on the bench when building SX-200's, same console.
Also, pressing and holding either Vol key when powering up should get to the main setup menu.
And yes, you would still need to put the MAC in the appropriate controller.