(Minneapolis, MN)  --  Officials are making changes after some 9-1-1 calls went unanswered during the shooting rampage at a Minneapolis sign company.  City spokeswoman Heather Hunt says as many as six people who made 9-1-1 calls hung up when no one answered.  It's one of the reasons why the city will set up a recorded message to play if 9-1-1 callers don't get an answer within 10 seconds.  The recording will tell the callers to hang on until an operator is available.  Sixteen calls related to the shooting at Accent Signage System were answered.  The September 27th shooting left six people dead, including the gunman, and three wounded.