i've seen on here and elsewhere, that plusnet voip (@ sip.plus.net) requires natproxy.plus.net:5082 to be set too on the voip phone (sipdroid in my case). q1) what does 'natproxy' do exactly, as i cant set this on sipdroid? however despite this, i can make outgoing calls, i just cant receive them. is this down to natproxy. if it is down to natproxy,, then i'm unsure why 'linphone' (on linux) works completely fine inbound and out for plusnet and i cannot set natproxy on that either. and lastly, sipgate works fine too on sipdroid, linphone etc. it just seems that inbound calls do not get through on sipdroid for plusnet. thank you for your time if you read this and if you can shed some light.