ised to be widely deployed as the preferred transport protocol for the next gen- eration Internet. The multi-homing, multi-stream and partially-reliable data delivery features of SCTP are especially attractive for applications that have stringent delay and high reliability requirements. By extending SCTP with © 2009 by Taylor & Francis Group, LLC SIP Handbook: Services, Technologies, and Security Dynamic Address Reconfiguration [36], the resulting protocol called mobile SCTP (MSCTP) [20] becomes a good choice for supporting node mobility by taking advantage of the multi-homing capability of SCTP. The use of MSCTP to manage vertical handoffs between WLANs and cellular networks was proposed in [21], which considers MNs that are configured with multiple wireless network interfaces and therefore, can acquire multiple IP addresses in association with an SCTP connection in situations where vertical handoffs can potentially take place. The vertical handoff operations can be completed simply by having the MN handshaking with the CN to reconfigure the sec- ondary address associated with the newly preferred network as the primary address, and the current primary address as the secondary address. Using MSCTP to manage vertical handoffs has many advantages, including simpler network architecture, improved throughput and delay performance, and ease of adapting flow/congestion control parameters to the new network during and after vertical handoffs [21]. In [22], an improvement to MSCTP called Sending-buffer Multicast-Aided Retransmission with Fast Retransmission (SMART-FRX) is proposed. This scheme consists of two sub-schemes that perform different functionalities to enhance the MSCTP performance during WLAN to cellular forced vertical handoffs, namely: (1) The Sending-buffer Multicast-Aided Retransmission (SMART) sub-scheme that forces MSCTP to immediately enter into slow- start over the cellular link at the beginning of the vertical handoff period, by multicasting the data buffered in the primary WLAN link on both the cel- 