Hello,
When I call somebody, the distant phone don’t display the caller number.
Why ?
Is that possible to display the extension name ?
For exemple, my number is 1234 and the extension is 101 name Thierry.
is that possible to display 1234/Thierry ?
Probably, but your question is really too short to tell us what you are trying to do and on what phones you are trying to do it. Both of those things will color the answers you are seeking.