How to configure a dedicated line for analog users on the OSU board of the U1900?
1211. Log in to the web UI, choose User > POTS User, and configure a dedicated line for a port of the corresponding board.
2. You can also configure a dedicated line using commands. For example, you can run the config modify subscriber directdial dn 2800 slot 0 portinboard 1 command to bind user 2800 to port 1 in slot 0 of the OSU board to form a dedicated line.