In reply to a post by tdw42:

In reply to a post by Tacitus:

I'm assuming the master socket becomes useless once the ONT is installed since any phones are wired to the router, either directly if it's one with VoIP or via an adaptor (EG Grandstream 801/802)

Unless you have wired secondary phone sockets. Openreach seem to have abandoned fitting a voice reinjection faceplate which allow an ATA in the router, or separate, to be connected to the house wiring completely isolated from the external wire back to the exchange. There are articles on the web describing how to make a DIY version.

Thanks for the reply.

At present the unfiltered Cat5 goes direct to the router socket. The 3 phone sockets on the phone circuit are wired in parallel via CW1308 cable whch terminates at the master socket and is hardwired to the faceplate filter.

I think the best way would be to get the installer to put the ONT as close as possible to the current master socket and then as you suggest crimp an RJ45 onto the end of the Cat5 which should be possible. The last phone socket in the chain is near the router so disconnect the phone circuit at the master socket and then run a cable to the end socket in the chain via an ATA either internal to the router or separate Grandstream etc. Effectively it would send the phone signal the reverse way round.

Should work and wouldn't be too messy to achieve. When the house is redecorated I could think about installing Cat6 all the way through although it might be simpler to buy a DECT setup - Gigaset and Yealink seem to be good.

In reply to a post by Tacitus:

Should work and wouldn't be too messy to achieve. When the house is redecorated I could think about installing Cat6 all the way through although it might be simpler to buy a DECT setup - Gigaset and Yealink seem to be good.

I'm using a Gigaset N300AIP connected directly to the router. And for a few weeks before the fibre was installed it was connected to the BT master socket.

One of the nice features of the Gigaset N300 series is that you can continue to run it with an PSTN connection and several VoIP connections simultaneously.