I had tried that very same shortcode (using direct dial) and that is when I discovered that Internal Auto Answer on the J179 phone was off. The phone just rang like a normal intercom call. When I turned the Auto Answer on from the phone, then the Dial Direct worked as expected. However, if the phone reboots, then Auto Answer is disabled again (and button clicks re-enabled). I was hoping that there was a setting in the file that addressed both of those settings, but it isn't looking like there is.