Last three digits of phonebook causes failure with extension

hey,

I got a seriously strange problem with my snom370 and asterisknow 11.11 with freepbx…
If I enter a phonenumber to the phonebook of my snom370 with e.g. 199 at
the end of the number, and I have an extension number 199, and I receive an intern call from extension 199, the name of the phonebook-number is shown on my display, and not the name of the extension…
so anyhow only the last three digits of the phonebook-number get proved, but this is not what it should be like ??