From the very start all at Xinix provided excellent advise, hand holding and support carried through to a very caring operater called Uzair who calls on occassion to check that all had worked in set up and guided on set up and then checked all ok for number porting etc .. I am incredibly impresssed with Xinix and their team. As for the line quality it is something that myself and household have not had to discuss as it is great, never lost a call, only ever had a good quality connection. if you need VOIP and your not sure then call Xinix, I was so blind to how it all worked and they asssited me so well, its good value and seems best deal I could find in UK.