two lines with same number

Sorry, first time here and know almost nothing about voip.

Hope someone could help me.

We area little company in Italy: we have a modem which output 2 analogues lines. 

Actually I know that they are voip lines which somehow are converted into analog.

The two lines have the same phone number.

Both lines are connected to a Yeastar S20.

When someone calls, all the voip phones ring, but when someone answer to che call, all the phones do not stop ringing.. like the Yeastar does not understand that someone has answered.

Any suggestion on how to solve this issue?




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