Dear WH,
The 3200 on the back is the generic model for all digital Tenors of that generation. The easy way to tell the exact model type is to telnet to the unit and type ‘dis v’. This will tell you the model type and options that are loaded to the system.
As for configuration for a calling card business, you must have a radius server setup to perform the actual authentication of inbound calls, then the configuration of the Tenor will be different depending on whether you will use the Tenor to send calls to IP or receive calls from IP to the phone line or both.
Mike