In the picture of the All-in-One, some have wondered about the gizmo on the top of the can:

[Linked Image from i143.photobucket.com]

This is the "intersystem bonding termination." That is, a place for the phone guy to land his ground wire.

This particular version is made by T&B, and self-clamps to the can. A more common version is the type used on this kiosk:

[Linked Image from i143.photobucket.com]

With the 2011 NEC, section 250.94 requires such a provision. It's worth a close look at 250.96.

As I read it, at least, there's no requirement that that you use a listed gizmo for the connection, or that the connection be made to the EGC. It appears that a simply length of free #6 wire (how would you support or anchor it?)would suffice, as would simply mounting a ground buss to the outside of the can.