The contemporary ring extension external number does not work


inserted the extension number 3472283986 on the extension 201.
However, calling 201 201 rings only 201 and not the external number 3472283986, what could it be?
(the outgoing rules are correct and the number 3472283986 individually I call it regularly).
Can you give me a hand?
thank you


How and where you set it ?


set correctly,
I realized now that it was a problem with the Trunk Voip settings