There are some info about Analog gateway ,Please note ,Maybe can give you a hand.
1. The default IP of analog gateway is 172.16.99.1 , You can connect the web interface by this IP address.
2.If you miss the IP address of the gateway, Please connect an analog Phone to the first FXS port of the every gateway board,Then press "**" to broadcast the IP address.
3.If you want to reset your configuration you can do the same action as above 2 and Press "*1*2*3*4" to factory reset .