Digium

The 1A4B03F belong to Digium family of  A4 Series. This card can be installed in server PCI-Express slot. This card has built in Echo Cancellation

Digium 4 Port E1/T1 digital asterisk card 1TE435BF supports up to 120 concurrent calls ideal for large call center. This card works out of the box with any asterisk version.

This Asterisk card is a four FXO ports, plug and play PCI/PCIe card. By Usin 410P analog card, open source Asterisk PBX and stand alone PC, users can create their SOHO telephony solution include all the sophisticated features of traditional PBX, and extend features such as fax in IP PBX.It supports standard  dahdi / zaptel  drivers , can work with Asterisk / trixbox / elastix