The Digium single span digital card is one of the latest additions to the telephony card family. It has leading industry desgined components to support T1/E1/PRI environments that require a high-performance, cost effective digital telephony interface card. This Digital Card creates a seemless network interconnecting traditional telephony systems with VOIP technologies. Overview: The Digium PCIe T1 card works with Asterisk, Switchvox, FreePBX, and various open source PBX distributions. e4 offers free support for this and other Digium telephony cards. 1TE133F will ship on this order