AX-400P is the TDM400P compatible
PCI card that support up to four FXO and FXS combination interfaces.
Using AX-400P series PCI 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 voicemail in IP PBX.
User can use AX-400P with standard Zaptel device driver and Asterisk
source code without modify any code. The FXO and FXS module are interchangeable
to suit various requirements.