For the business phone system that needs a larger amount of single line analog telephones (SLT), or analog devices, such as fax or credit card machines, this extension card will provide you with up to 8 ports.
For the business phone system that needs a larger amount of single line analog telephones (SLT), or analog devices, such as fax or credit card machines, this extension card will provide you with up to 16 ports.
The CPU Card is the system's control center. It provides the system's Linux operating system, central processing, stored program, and memory for the customer's site-specific data. Every system requires a CPU Card.