IP Office 系统的基本部分是本系统或控制单元。它保存系统配置并控制系统操作。通过添加各种内部卡，例如中继卡，可自定义每个控制单元。还可连接外部扩展模块，以添加更多分机和中继端口。
IP Office 版本 6 支持下列 IP Office 控制单元。
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15-601042 CHS Issue 21.e.-
14:05, 30 March 2010
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Last Modified: 10/03/2010