xman- there's a lot of myths perpetuated by the call centre monkeys at ISPs, who have only the screen script ,but no technical know how to act on, when trying to diagnose problems. IMHO- monkeys should be asked to refer problems to those trained to look at a problem. i.e ,an Engineer.

Firstly- there's no need for a filter on all phones. I can get in excess of my ISP speed  on WiFi ( with a correctly positioned router) ,with my system. I'm on an up to 30Mb connection. I regularly get in excess of this.

At the master socket, I add a filter. On the BB socket, I plug in the router. That is BB sorted. On the phone side ,I plug in a socket, and rout that to terminals 2 &5 of a MASTER socket. That connects to the lots of  slave sockets in my house with only a max of REN 4 in circuit.

Another solution I've done is to send the BB on a dedicated pair of wires( in a proper telecomms cable) to near to the PC, filtered the BB and phone line and returned the phone line to rest of house. It's not something I've done as it means me tracing a pair from master socket to near my PC,and gettng down is easy,. These days it's getting back up. Should I find speed problems, I have have the answer to screen script monkeys. I have a length of CAT5 with sockets and cables to connect my PC direct to master socket. That's where brains and Tech know how over rides script BS.

 

After messing about with rubbish ISP provided routers I eventually but the bullet and abought a TP-Link mesh system as it was on sale a couple of years back.

 

I've never had such stable and fast WiFi before. Our flat is quite large with the bedroom right down at the other end of the flat.

 

Thankfully we have proper gigabit ethernet wired into each room so the WiFi nodes (3 of them) are all interlinked via ethernet.

 

I get our full 100mb right down there.

 

The ISP DSL Router is then stuffed in a cupboard out the way.

 

I do like how the router works though. It has a built in DSL filter and built in DECT base station. So you just pair the DECT phones directly with it. Also has an answerphone and I can retrieve the messages via an app.

 

The only disappointing this is the lack of modem or passthrough mode. I've had to just add the mess WiFi IP to the firewall exception so all ports and traffic are passed through for the TP-Link firewall to deal with.