A method and a first network node for managing a Stream Control Transmission Protocol, “SCTP” is disclosed. The first network node handles a plurality of computational resources for executing procedures of SCTP at least partially simultaneously. The first network node provides a single instance procedure for managing the SCTP association and multi-instance procedures for managing the SCTP association. Furthermore, the first network node provides a control procedure, being the single instance procedure, for managing flow and acknowledgement of SCTP packets at the SCTP association. The first network node provides the following multi-instance procedures an outgoing transmission procedure for managing and transmitting the SCTP packets from the retransmission buffer, an incoming reception procedure for receiving and managing the SCTP packets, and an outgoing reception procedure for managing and transmitting Upper Layer Protocol frames to the upper layer.