Telephony Cards: A telephony card is a credit card size plastic or paper card, used to pay for telephone services (often international or long distance calling). It is not necessary to have the physical card except with a stored-value system; knowledge of the access telephone number to dial and the PIN is sufficient.
Telephony cards, 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.