I suspect you are going to have to do the same as me i.e. run an ADSL data cable under the carpet from the phone socket to the system.
I use a 10 metre cable (five metres was just a shade too short)...:-(
Surface Pro (2017) vs Surface Pro 4
Where HTML5 is headed next
MacBook Pro v Surface Pro 5
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.