Shocking!!!! Avoid at all costs. Constantly not working. From a business point of view it has cost me thousands. Phone does not ring, or sounds like it's ringing from customers end and no-one answers (as it's not actually ringing). Keep getting fobbed off by BT who say "re-set the settings and it will work" - IT DOES NOT, "Oh you need a new hub, then it will work" IT DOES NOT. They keep bull s****** with excuses. AVOID AVOID AVOID unless you are a billionaire who can afford to loose money