A state representative is calling for immediate action to address a staffing shortage at the state's 911 call center.  Cranston Representative Robert Lancia says he received a tip claiming overnight staffing has dropped below the previous minimum level of eight to as few as four dispatchers.  Lancia says thousands of calls have been put on hold because of a staff shortage and he calls it a potential disaster in the making.  He says the problem is early retirements and no money in the budget for new hires.