transmitting voice via internet

I can use microphone to capture the voice, but I cant transmission to other player. And the microphone only can plugin “Audio Source”, I want the GamePlayer equip a microphone. Finally if i can finish i say above, actuality the voice should encode & decode, Unity can help us to do this?
thanks a lot

Vote for it here: http://feedback.unity3d.com/forums/15792-unity/suggestions/166172-networking-voip-support-e-g-rakvoice-