Telephony cards, or telephony boards, are the essential hardware components of telephone systems that integrate with computers (i.e. CTI). Telephony cards are installable circuit boards that usually fit into PCI slots in computers. A telephony card can perform all the main features of a telephone system. The card can be used for PBX or IVR systems, call recording, dial dictation, DTMF tone detection/generation, analog-VoIP conversion, etc.