Cheap solution for a hands-free device for the Smart 451?

hello I’m usually in the Honda forum. Since we are allowed to call a new Smart Brabus exclusive our own since Saturday, I will probably also occasionally add my mustard here 🙂 On our Brabus the Radio 9 with sound system is installed. Now I want to install a Parrot MKI 9200 hands-free device with iPod connection. I have already found various PIN-legs of the ISO plugs and their peculiarities with the search function. However, information about the Mute connection is missing. Can anyone help me here? Gruss, hoele [Transferred from motor talk from the topic ‘Mute connection Radio 9’.]