I think Michel was asking if there was a phone that could import/use/display the contacts from his Google Voice account, not just display contacts manually keyed into the phone's own directory.
I don't know of any standard (not VoIP) DECT phones that can do that, but you might do some searching of features, to see if one of the vendors has a contacts download feature. This would be some PC-based program that imports the GV (or Outlook) contact DB and then converts and syncs it with the phone. I have a Gigaset VoIP DECT phone that can do that.
The other option is to subscribe to the paid OBiEXTRAs service, which provides Google Contacts sync and display, or buy an OBi IP phone, which can download Google Contacts directly to the phone, at no charge.