Firstly, can I sign up to any VOIP provider using any ISP?
Can I have a fax machine running on the VOIP line? - If so, when the fax is in use will the phoneline be busy as normal?
Can I have more than one phone connected? If so what is the best way to do this? Also, if one phone is in use and another is picked up will the calls be heard by both people as with a normal line?
And finally... Who is the best VOIP provider?