Multiple line availability

I have a grandstream 2160. It is a single main line. How do i set it up so other lines can be utilized? I know if i assign the other buttons to line/default 1 it should work. Will it still work if a ring group is calling the extension or should i push the inbound str8 to the extension instead of the ring group?

IN ADDITION: Will the phone ring for the second line/extension, if someone is on the phone, headset to ear.

I usually assign at least 3 line buttons to a handset. This allows the user to put the first caller on hold and answer the second or third caller.
I also find it easier to do conference calls. Call first person, hold, get second caller on second call appearance, then conference the two together.
Just a personal preference.

you need 3 lines to do conference call?

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