LOL!The trick is to type the buzz# in quickly, so it only announces the first or last number out loud.
One time I discreetly walked in with a group. When I told Andy I was already inside he told me to walk back out and come back in again when buzzed. So, I walked past the security guard on my way out and again when I walked back in. The guard was probably wondering why is this dude walking in and out and in again?