LIBPRI is an open source library that encapsulates the protocols used to communicate over ISDN Primary Rate Interfaces (T1, E1, J1). LIBPRI is a dependency for Asterisk and DAHDI if PRI signaling is used
DAHDI (Digium/Asterisk Hardware Device Interface) is the open source device interface technology used to control Digium and other legacy telephony interface cards.
DAHDI Linux / DAHDI Tools
DAHDI Linux is the open source device driver framework used to interface Asterisk with telephony hardware. DAHDI Tools is a package of utilities for managing and monitoring DAHDI devices. The download on this page provides a combined package of the latest DAHDI Linux with the latest DAHDI Tools