tp-link Archer VR900 router with power supply and DSL cable (Chalford GL6)

For a description see https://www.tp-link.com/uk/home-networking/dsl-modem-router/archer-vr900/ and for manual see https://www.tp-link.com/uk/support/download/archer-vr900/
This was in use until quite recently and worked well but was unable to cope consistently with an updated VoIP telephone. Without VoIP it should continue to work well.