| Attribute | Must | Description |
|---|---|---|
| X25-Call-User-Data-Incoming | Given by the public carrier. Example: 313 0101 | |
| X25-Facilities-Data-Incoming | Specifies which facilities the switch will support e.g. window size negoiation | |
| X25-Leased-Line-Port | X | Specifies which port the Eicon card will use. |
| X25-Leased-or-Switched | If not specified defaults to Leased (TRUE=Leased, FALSE=Switched) |