What kind of equipment do I need to do sharing as well as having VOIP > calls using regular phones. > do I need to have purchase regular VOIP router which can also share > connection, or do i need to have specific differnt one for ADSL.?
Any VoIP router should work, or you can buy a router and a separate VoIP adapter. Your ADSL modem should have a jack for a normal Ethernet cable to plug into your router. If it doesn't (there may still be a few that are USB only), call up the telco and tell them to switch it for one that does.