The 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.

The modular nature of the cards allows you to mix and match between line (FXO) and station (FXS) interfaces, giving you the exact port configuration you need. Digium A4 Series analog cards are available in low profile, half-length PCI and PCI Express form factors.


  1. One (1) - four (4) analog ports
  2. PCI or PCI Express bus architectures
  3. Combine line (FXO) and station (FXS) modules
  4. Accepts up to four (4) single-port modules
  5. Optional DSP-based carrier grade echo cancellation module
  6. 32-bit 33MHz
  7. Loop Start or Kewl Start Signaling
  8. Temperature: 0° to 50° C
  9. Digium patented VoiceBus™ technology for better audio
  10. 30-day 100% satisfaction money back guarantee
  11. 5-year warranty
  12. With Asterisk - DAHDI 2.8 or later required
  13. With Switchvox - Switchvox 5.8.1 or later required
Please click on the identified photos or here to learn more about Digium Cards. If you would like to obtain quotes or learn more about our wide array of products, services, and support, please e-mail us.