Starting Monday, Holbrook will begin taking 911 calls from Whitman, which is joining the emergency communications center housed at Holbrook’s public safety building. Steve Hooke, manager of the center, said it will field all of Whitman’s 911 calls, do emergency medical dispatch for the town, and serve as a backup dispatch site for the Fire Department. To cover the cost, the center will receive Whitman’s state 911 funding, which is about $80,000, Hooke said. The growing operation already provides various services for Abington and Sharon as well as its host community of Holbrook, and does dispatching for several state hazmat teams. It also houses Norfolk County Control, a coordination point for mutual aid among the county’s fire and emergency medical services. Hooke said the facility probably has room for one more town before it would need to expand.