I don't know the Sunrise tv box, but with the Swisscom tv box there were various options.
For example, you can connect the 3.5 mm jack plug directly to the tv box and deactivate the sound from your tv.
Disadvantage: the sound only works when it is running via the tv box.
there is also a second variant with the optical cable if your tv or tv box from sunrise has an optical input.
but if you only want to use the bose remote control, there is a youtube video:
https://www.youtube.com/watch
