| Word | Description |
| CDR | Call Detail Records: detailed information on every connected internal and external call on the system. |
| CT-Bus | Computer Telephony Bus: the transport mechanism that provides TDM (Time Division Multiplexing) support over PCI (Peripheral Component Interconnect). This is the white 40-pin ribbon cable that connects on the top of all of AltiGen's PCI telephony boards used in the Office series servers. The Max series servers do not use CT-Bus. |