Which wire diagram to use for 3-way?

[SViel]

I will be making some assumptions:

1. The box shown in the pictures is where your live comes in and where the power goes to the switch. I notice there is a red cable twisted with the black ones, so I assume that this is where your live connected, and that it is being fed to your other switch via the red cable in the 3-way cable.
2. The cable going to the lamp is one of the black ones on your switch

So I think that you have the following setup, so would need to wire this way - with the Inovelli switch in the box from the pictures:

See more information and connection options here:

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