Bizarre name. People who screen calls and control access to other people are receptionists or secretaries, not janitors.
When was the last time a janitor told you that Mr. Smith isn't taking any calls right now?
When was the last time a janitor told you that Mr. Smith isn't taking any calls right now?
How did they end up with "janitor". I'm looking at thesaurus.com and it doesn't list "janitor" as a synonym for any word that denotes a protector of something.
There is "custodian"; sometimes building janitors are called custodians, but that word has connotations of taking care of something (having it in your custody).