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To make possible the IPBrick's interaction with telephone systems, you need to install specific hardware. This hardware includes PCI cards that can be analogic, RDIS BRI or RDIS PRI. Analogic cards provide the connection to telephone networks working in analogic mode. If telephone networks are working in digital mode (RDIS), cards may be BRI or PRI. A BRI (Basic Rate Interface) access has three channels: Two 64kbit/s (B) for data/voice and one 16 kbits/s (D) for control. The PRI (Primary Rate Interface) access corresponds to 30 B channels plus one D channel in Europe - can also be designated as E1 circuit.