ZXM400 is an interface module card of simulation telephone, which can support 4 Line simulations outside-line, and FXO can make up with FXS freely. It meets the flexible demands of small and medium-sized enterprises, and it's the most popular and use cards of Asterisk. It can the rate of compatible for Digium's TDM400P is 100%. The user can use the driver of totally the same as ZAPTEL and Astresik software without revise any software codes. Main feature Suitable for SOHO PBX and small enterprise application Voice mail IVR system Caller ID detected Conference Four FXO/FXS module interchangeable Configuration --module --motherboard(capable for four module) --FXO module --FXS module