Enter into the Abilis control-program and type the command d dev to view the list of devices.
Abilis automatically assign a USB port id when a USB device is added and plugged.
[17:49:02] ABILIS_CPX:d dev
...
------------------ Active USB Devices and Physical Resources: -----------------
Device(s)   Run Con Physical Resource(s) or CTI Port(s)    USBPORTID
-------------------------------------------------------------------------------
DSLUSB-1    Yes Yes Dsl-1  . . . . . . . . . . . . . . . . 3.0
DSLUSB-2    No  No  Dsl-2  . . . . . . . . . . . . . . . . 1.0.0
DSLUSB-3    Yes Yes Dsl-3  . . . . . . . . . . . . . . . . 1.1
DSLUSB-4    Yes Yes Dsl-4  . . . . . . . . . . . . . . . . 2.0
GPIO-1      Yes Yes Gpio-1 . . . . . . . . . . . . . . . . 4.0
BLUSB-1     Yes No  Blusb-1  . . . . . . . . . . . . . . . -
...The usbportid can't change on-the-fly plugging and unplugging a
    device on a different port. If connecting a device on a different port is
    needed, follow the below steps to reconfigure the
    USBPORTID parameter:
| s dev:[device name] usbportid:none | Cancel the usbportid. | 
| save conf | Save the configuration. | 
| warm start | Restart Abilis. |