Digium 1A4B04F PCI-E Card - 2 FXS, 2 FXO - Echo Cancellation

Digium 1A4B04F 4 Port Modular Analog PCI-Express X1 Card w/ 2 Station And 2 Trunk Interfaces & HW Echo CanThe A4 Series of analog cards supports up to four (4) connections per card in your Asterisk system. Using Digium's single-port interface modules, A4 series cards can scale from one (1) to four (4) ports.Features: One (1) - four (4) analog ports PCI or PCI Express bus architectures Combine line (FXO) and station (FXS) modules Accepts up to four (4) single-port modules Loop Start or Kewl Start Signaling Digium patented VoiceBus technology for better audio Optional DSP -based carrier grade echo cancellation module Available in low profile (optional bracket), half-length PCI and PCI Express form factors. 5-year warranty Compatibility: Asterisk DAHDI 2.8 or later Switchvox 5.8.1 or later