Includes Mediant 1000B chassis, OSN4, 6 GE ports, single AC power supply and fans. Chassis can be expanded with Mediant 1000 PSTN modules such as FXS/FXO/BRI or T1/E1. Supports SBA for Microsoft Skype for Business (up to 1000 SfB users). Includes Windows 2012 R2 OS license.SBC capabilities can be enabled using orderable software options. Preloaded with AudioCodes Communications-Enabled Business Processes (CEBP) applications. License for CEBP applications can be ordered separately.Note: AudioCodes will accept orders for this part number, but the item will be shipped only one month after Microsoft's official SfB SBA release.