The present invention relates to methods and arrangements to optimize load transportation between a P2P live streaming network and an access network. The method comprises steps like: a peer in the access network selects a live channel to use; a request comprising information of the selected channel is sent from the access network to the streaming network a converter node connecting the P2P live streaming network and the access network detects that a number of peers in the access network using the selected channel has reached a predetermined threshold value (T) and chunks that are parts of the selected channel arriving from peers in the streaming network are converted in the converter node from P2P format to multicast format.