Gira uses a proprietary encryption therefore no Gira systems are compatible with Nuki. If you have access to the main console you can buy and add additional pieces to the intercom which allow the Opener to open a door by shortening a contact (relay). Here are some details about a possible solution: Nuki Opener with Gira AP and Türkommunikations- Tasterschnittstelle 2fach 121000 or Unterputz Schaltaktor 121100