Téléphone fix does not work

[Mai]

Hello. Is there anybody who can help me please.
Internet box is working but téléphone fix does not work since I changed to orange to Sosh.
I can not call out , either receive the call.
I tried to turn off and on the live box , still the problem is stay.
When I call the fix number , it ring on the phone but téléphone fix does not ring( no. Nothing....)
I believe is it not the telephone problem, then I have to buy new phone fix, though I wanted make sure that is the phone machine problem before I actually buy ne one because this problem happened from me changing to Sosh servis...