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.
Digium patented VoiceBus™ technology for better audio
With Asterisk - DAHDI 2.8 or later required
Digium offers a full line of high quality analog interface cards to connect your IP PBX, IVR, VoIP Gateway, or custom telephony solution to the public telephone network. Select from the available attributes to find the telephony card(s) that match your requirements: