@Dg117
You don't need anything: the point of a filtered master is to make additional plug-in filters unnecessary.
However
a) a router cannot work on any other socket(s)
and
b) once SOGEA broadband is provisioned at an address, other sockets don't work for voice either: only the port on the rear of the Hub can host a phone handset or DECT base.
* * * * * * *
Sky Glass 55" (on ethernet) & two Stream Pucks (one ethernet / one WiFi)
BT Halo 3+ Ultrafast FTTP (500Mbs), BT Smart Hub 2
