For Wideband Switching with non-ISDN-PRI equipment, you can use an ISDN-PRI terminal adapter. ISDN-PRI terminal adapters translate standard ISDN signaling into a form that can be used by the endpoint application, and vice versa. The terminal adapter also must adhere to the PRI-endpoint boundaries as administered on Communication Manager when handling both incoming applications to the endpoint and outgoing calls.

The terminal adapter passes calls to and receives calls from the line-side ISDN-SETUP messages. These messages indicate the data rate and the specific B-channels (DS0) to be used. The terminal adapter communicates all other call status information by way of standard ISDN messages. For more information, see DEFINITY® Line-Side ISDN Primary Rate Interface Technical Reference.