Passcode to login authentication
At Sidra Hospital in Qatar, the users feel that it is a flaw of Vocera that anyone can login as someone else. They are concerned about how easy to steal someone elses vocera identity. It is also difficult to track down the culprit in case it happens. Also it does happen by mistakenly and users are not even aware that it is someone elses profile as sometimes they've recorded their own voice.
I suggest that users should have the option, where they can setup a numeric 6 digit pass code if they wanted to. When login after saying or spelling the name, genie should ask the user random three digits of the pass code. On confirming the right numbers genie will log the user in.