I have just acquired one of these beasties and it set up and registered with my voip provider through its web interface quickly amd easily. I went into it to change the ringing cadence to make it similar to UK. When I rebooted it went off line (deregistered) and would not reconnect. So I did a full reset on it - MISTAKE! It has come back with DHCP on and collected its IP address from my router (and for that matter the time as well.) However whenever I try to access its browser interface to set it up again it rejects the password I enter - that is any password I can think of including 'admin' which is its default. Anyone come across this or got any ideas? Grandstream seem pretty hopeless at support as far as I can see.