You need to set the DHCP Option 60 for the WAN interface to 100008,0001 in the router configuration menu.
Fibre optic connection (FTTH)
You need to set the VLAN ID to VLAN ID 10 in the router configuration menu.
To allow the Swisscom TV service to work with an external router, the Enable IGMP Multicast Proxy must be activated. This also applies to the network switches for all other manufacturers. Wherever possible IGMP Snooping should also be enabled.