Dial and show name from Aastra phone

I was told by my PBX supplying company that an Aastra phone (55i) joined to an Asterisk 1.6 installation is no longer able to show the name of the internal number that I am calling. Hope somebody can verify this for me.
Before it worked like a charm. I entered an extension number and it would then show me the name of the person I was calling. Now it only shows me the name after I am connected. I am trying to find out if they are telling me the truth, hope somebody here can help me out.