It's the main outgoing line for both the Vancouver Island Health Authority's Corporate office, and all the buildings on the Royal Jubilee Campus.  

I used to find lots of missed calls on my call display when I got home from work.  When I called back, the switchboard operator said there is really no way to figure out who was calling.    So I talked to the corporate office at VIHA and they put me through to the Security Department.  Ten minutes later, the security guys, they had the phone records and traced it to a telephone in the Eric Martin Pavillion (Psych) and were able to confirm by video footage that it was one of the less sane patients.

Got a call back from them (They deliberately used a different number so I would know to pick-up) and was informed that the situation was resolved.  The patient was attempting to call someone who didn't exist and thought that my number was his.

It's been over a week now, and I haven't been called.