I had no trouble adding my Sunrise box to the remote control. It's listed under the Umax manufacturer's name. I was able to configure the channel change and on/off buttons. The box I have is model 2008C-STB-Sunrise by Umax

I don't think so, only TV and hi-fi devices.

The Smart Control Pro Touch URC 7985 is a universal remote control that can control up to 12 devices, including set-top boxes, via infrared and Bluetooth. It is compatible with many streaming boxes and TVs. However, there are special instructions for the Swisscom TV-Box 5 (IP2300): The box uses Bluetooth Low Energy for the remote control and the original remote control is specially designed for this. Universal remote controls such as the Harmony sometimes have recognition problems with the IP2300, and it is recommended to use an IR adapter and set the correct code (e.g. 2401). As the Smart Control Pro Touch URC 7985 supports Bluetooth, it could theoretically work with the Swisscom TV Box 5, but no official confirmation of compatibility with this exact model is available. It is unclear whether the URC 7985 fully supports the specific Bluetooth LE standard and control protocols of the Swisscom TV Box 5. To summarise: The universal remote control can control many devices, but there is no assured confirmation of compatibility for the Swisscom TV-Box 5 (IP2300). For reliable control of the box, the original remote control or a specially customised remote control is usually recommended.

Unfortunately, there is no official confirmation of this. It is best to enquire directly with Quickline about compatible devices.