Why not go the whole hog, and fit a Cat6 RJ45 outlet instead of a phone socket, so the phone can be connected with an adaptor like this
If connected downstream of the linebox/master socket you're probably better off with the (cheaper) vanilla 'extension' version - https://www.tlc-direct.co.uk/Products/GPBT4503.html - the 'master' (and PBX master) versions re-generate the bell signal and can result in 'bell tinkle' when dialling especially if someone still has an old rotary dial phone or push-button phone set to LD dialling. UK phone deliberately short out the bell wire during LD dialling to prevent this - and master adaptors defeat that.
Why not go the whole hog, and fit a Cat6 RJ45 outlet instead of a phone socket, so the phone can be connected with an adaptor like this
If connected downstream of the linebox/master socket you're probably better off with the (cheaper) vanilla 'extension' version - https://www.tlc-direct.co.uk/Products/GPBT4503.html - the 'master' (and PBX master) versions re-generate the bell signal and can result in 'bell tinkle' when dialling especially if someone still has an old rotary dial phone or push-button phone set to LD dialling. UK phone deliberately short out the bell wire during LD dialling to prevent this - and master adaptors defeat that.
