This product is a replacement for: Digium - 2 Span Digital T1/E1/J1/PRI Card & HW Echo Can. (1TE220BF) Two (2) span digital T1/E1/J1/PRI PCI-Express x1 card and hardware echo cancellation (VPM064). This card requires Switchvox release 5.8.1. This card is recommend for use with Asterisk installations. Digium's dual span digital interface cards support 48 (T1 / J1) or 60 (E1) connections to PSTN trunks over two spans (digital circuits). Built exclusively for use with Asterisk and Asterisk-based communications systems, the dual span cards provide the best value in digital connectivity. Dual span digital cards are available in PCI and PCI-Express form factors. All dual span models can be combined with an Octasic DSP-based echo cancellation module from Digium to provide effective hardware echo cancellation across all channels. Digium cards are compatible with all versions of Asterisk using the DAHDI driver framework. Asterisk and DAHDI are available for free from the Asterisk.org website. All cards include a five (5) year warranty and are eligible for Digium's Exceptional Satisfaction Program (ESP) risk-free Quality Guarantee. Note: The TE210P model supports a 3.3v PCI slot only - typically available on newer server motherboards and in 64-bit PCI bus architectures. The TE205P is for use only with a 5.0 volt PCI slot.