We have been in business since 2006 selling refurbished telecom equipment.
With the NEC DSX40 4COIU-S1 4-Port CO Line Card, you can easily expand your system's capacity by adding four new CO line ports that feature built-in Caller ID. It's important to note that this expansion card is designed to be installed in the bottom expansion slot and that the maximum number of outside line ports for the system is limited to 8.