I don't know.  I recieved the new RG about 2 days after I contacted ATT.  When I opened the box there were 2 smaller boxes inside of it.  And I thought the bigger box was the RG but when I opened it I saw the new BBU.  The smaller box had the RG in it.  The first BBU was black, this new one is gray.  Why they did it?  All I can think of is, FAVOR.  I thought they always included a new BBU with the RGs.  I do have the VoIP service though.  Maybe that had something to do with it.