Digium X400M FXO Module
The 
Digium X400M  is a quad FXO interface module for the TDM2400P. The module enables the  TDM2400P to terminate four analog telephone lines per module. With  Digium's Asterisk Open Source PBX software, you can build your dream  telephony environment with all of the high-end features of a business  telephone system.
Digium X400M FXO Module Information:
Because of the modular design, a user can activate additional ports at  any time with more S400M or X400M daughter cards. The S400M module passes all the  call features any standard analog telephone line will support.  Worldwide certifications are pending.
Using this card in concert with  Digium's Asterisk software, standard PC hardware, and the Linux OS, you  can create SMB or SOHO telephony environments capable of satisfying the  needs of small or medium business applications at an industry-leading  price.
Digium X400M Features:
    - 5 Year Warranty
- 4 Port FXO resource module
- Modular design
- Digium Exceptional Satisfaction Program (ESP)
Additional Product Information:
Digium Part Number: 1X400MF
UPC Code: 797734475487