Telephony cards are the essential hardware components of telephone systems that integrate with computers. The PC-based telephony boards are hardware that connects computers directly to legacy phone lines, phones and PBX system.

Telephony cards are installable circuit boards that usually fit into the PCI or PCI Express slots present in computers. The Telephony cards can perform all the main features of a telephone system.

Telephony cards can be used for developing IVR systems, call recording, dial dictation, DTMF tone detection/generation, voice mail, call transfer, bulk outbound dialling, etc.