Digium offers a full line of high quality analog and digital interface cards to connect your IP PBX, IVR, VoIP Gateway, or custom telephony solution to the public telephone network. Digium also has hybrid cards, voice compression cards, modules, and accessories built specifically for Asterisk.
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Digium 1A4B04F 4 Port Modular Analog PCI-Express X1 Card w/ 2 Station And 2 Trunk Interfaces & HW Echo CanSKU: 1A4B04F$548.08
Digium 1A4A04F 4 Port Modular Analog PCI 3.3/5.0V Card with 2 Station and 2 Trunk Interfaces & HW Echo CanSKU: 1A4A04F$492.83