Each board only has 4 span.The span number for all boards are only from span1 to span4.
If you want to send USSD from board2 with the ip of master board,you need to change the port of AMI.
master board:5038 board2:5039 board3:5040 ...
Or you can login it with the ip of module2 directly.
Sorry for the trouble.Maybe i am not say it so clearly.
You need not change the configuration files.I mean you need not edit the file manager.conf .Keep the configuration the same as you login the AMI interface of master board.
Here are 2 way you can login the AMI interface of board2.
Login your gsm gateway via ssh.Then,Login the AMI interface with the ip of master board and 5039.
Here is the screenshot below:
For the second way,you can login your master board via ssh first.Then,Login theAMI interface with ip of the board2 and 5038.Here is the screenshot below:
(I login it with the reserved ip of board 2.)