WinCC OA - CommCenter 4 Software Maintenance Service including hotline. Allows publicly available patches and upgrades to be applied. Duration 12 months. Must be purchased with a corresponding product. Enables the purchase of additional hotline support. Billing takes place annually in advance. Automatic renewal for 1 year if not canceled 3 months before expiration. Hotline support is covered by acorresponding SMS in the PowerTag configuration package. The SMS conditions apply.