The service provider has everything to do with the new behaviour of the phones. They do provide CPC on disconnect, but not on ROH. The Partner takes advantage of this function, instead of designing it to drop dial tone if a line is auto selected and then an auto intercom button is pressed without dialing anything on the dial tone. Even Comdial Executechs from 15 years ago did that! I've seen the issue come everytime a CLEC puts in an Adtran Total Access IAD, and training isn't going to change that.