NEC 0 Extensions Board (for Trunk DB) - IP7WW-000U-C1 Main Features: Allows addition of (1) 3-Port CO Trunk Daughter Board (3COIDB) or (1) PRI Daughter Board (1PRDB), when system has fewer station cards than CO Trunk/PRI Daughter Boards Only required for system configurations with fewer station cards than CO Trunk/PRI Daughter Boards Installs in any universal slot of Main or Expansion Chassis