First the settings for your ISP or carrier's physical device layer should be set in your CSU/DSU.
Then you should be able to access your service providers new system page with the boarder router's setup app.
Most are web accessed. Some are telnet.
Regardless, your ISP isn't going to want to give you that information though its usually readily available found on the web how to access and use after wading through pages of search garbage to find it.
Its usually open for connections to any source mac address. You must have an actual switched connection for digital services before you can even get that far.
i.e. With phone line DSL, you don't automatically get a DSL switched port just because its a service available in your area and you are wired to the box. Someone has to channelize your line in.
Before I had to replace the router, I was able to get an internet connection for my laptop (via the router used for other modem.)
Can anyone tell me why I now can't get the same connection from the new Huawei router.?