That number just plays some advertisement for a talk line then disconnects.
1-800-634-6753 , my bad. hit # when you get to the recording, then the extension.
I called up, went to extension 9037, and when it picked up i hit #94851. i then entered #*3180111*# . Those codes are detailed in the link i posted above. I then entered #7 and proceeded to speak after the beep, pressing 0 when i was done. You can change the recording on every elevator if you were so inclined. I have yet to get the *9 (announcement on all elevators) to work yet. But this is pretty fun.