Numbers within the address book are written as +31331234567. The same representation is shown on the display of the SNOM 320 phones. If the trunk is sending the calls directly to the extension the name in the address book is correctly displayed. If the trunk is sending the same calls via a hunt group the calls are not display the name.
If using: Group Name (Calling Name) call is displayed as within country like 0331234567
If using: Group Name (Calling Number) call is displayed as +31331234567
However if the entries are changed back to the 0331234567 representation still only numbers are displayed in both configurations of the hunt group.