The invention is able to solve issue effectively that IP network is easy to be attacked so that services on telecom level is available to be carried by safe IP network. Through logic isolation and technique oriented to connection, the invention builds dedicated channel for logic service stream between calling party and called party in services on telecom level needed of safe guaranty. Based on list item in stream classification table, service streams reached to PE to be transmitted are distributed to relevant logic carrying network. Service streams with no corresponding list item existed in stream classification table is as general Internet service to be forwarded.