Local directory and number with international code

In my local dictionary all my telephone numbers have the international code in front of it. For example the german code +49.
One entry is for example: John Rambo +4917401020304
If John calls me, I can only see the number which is shown without the international code: 017401020304 and not the name. Only if I remove all the international codes in the dictionary the name is shown, too. Normaly every other telephone and mobile phone shows the name independent of with or without the international code. Is that not possible with Yealink phones? I use T48G and W52P.