Phone rang twice, then they hung up.  Caller ID just showed "NY City of"

I did a search, and it seems this number is Bellvue Hospital!!

Received all call from this number at 6:40 in the morning... Could hear them trying to hang up phone once I answered... Smh

Called here twice, no message one 1st call, no one there on 2nd call.

I got a missed call on my cellphone. Have no friends in hospital that I know of!  They must have a LOT of lines that go out identified as the main # of hospital.  I'm assuming someone just dialed a wrong number.

UPDATE:  Just got a second call - it's a friend who works there.

I also received a call from them. They hung up as I answered the call. Based on google and online whitepages, it seems to belong to some hospital or medical-related company. Might have been a wrong number in my case.