The micro-mobility is an important aspect in ubiquitous communications, where the applications are anywhere and used anytime. In this paper, we analyze two solutions for IP micro-mobility. The first one is based on the Stream Control Transmission Protocol, which allows the dynamic address configuration of an association by means of the ASCONF messages. The second one is based on Session Iinitiation Protocol, which is the most popular protocol for multimedia communication over IP networks. Both in the single and simultaneous movements case, we show that for the SCTP solution, there is space for the further optimization of the handoff latency by using slight changes to the protocol. For the SIP solution, we show that for a correct and fast handoff, the SIP Server should be statefull.