AXE400P is a four FXO/FXS ports telephony card with PCI-E interface.Using AXE400P analog card, open source Asterisk PBX and stand alone PC, users can create their IPPBX telephony solution which includes all the sophisticated features of traditional PBX, and extend features such as voicemail in IP PBX.User can use AXE400P analog card with standard zaptel/dahdi driver and Asterisk source code without modifing any code.The FXO and FXS modules are interchangeable to suit various requirements.