3.1.5.1.2 STATE_CREATE_SESSION
If (UploadSuspended is TRUE) Set state to SUSPEND Return from this state. Obtain the host from BitsHostId (if not NULL) or Origin server Send CREATE-SESSION message to the server. If (error encountered in send) Set State to ERROR Return from this state. Receive the Ack response from the server. Update BITSSessionId, BitsHostId, BitsHostIdFallbackTimeout with the values received from the server. If (error encountered while receiving or reading the response info) Set State to ERROR Return from this state. If BitsHostId is not empty Set State to PING Return from this state. Set state to FRAGMENT